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科目： 來源：上海高考真題 題型：單選題

Small sailboats can easily turn over in the water _____ they are not managed carefully.
[     ]
A. though
B. before
C. until
D. if

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科目： 來源：上海高考真題 題型：單選題

— Are you ready for Spain? 
— Yes. I want the girls to experience that _____ they are young.

[     ]

A. while
B. until
C. if
D. before

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科目： 來源：浙江省高考真題 題型：單選題

We won't keep winning games _____ we keep playing well.
[     ]
A. because
B. unless
C. when
D. while

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科目： 來源：四川省高考真題 題型：單選題

— Why didn't you tell him about the meeting?
— He rushed out of the room _____ I could say a word.
[     ]
A. before
B. until
C. when
D. after

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科目： 來源：福建省高考真題 題型：單選題

Scientists say it may be five or six years _____ it is possible to test this medicine on human patients.
[     ]
A. since
B. after
C. before
D. when

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科目： 來源：高考真題 題型：單選題

I do every single bit of housework _____ my husband Bob just does the dishes now and then.
[     ]
A. since
B. while
C. when
D. as

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科目： 來源：江蘇高考真題 題型：單選題

_____ environmental damage is done, it takes many years for the ecosystem (生態(tài)系統(tǒng)) to recover.
[     ]
A. Even if
B. If only
C. While
D. Once

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科目： 來源：高考真題 題型：單選題

Several weeks had gone by ______ I realized the painting was missing.
[     ]
A. as
B. before
C. since
D. when

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科目： 來源：高考真題 題型：單選題

_____ you call me to say you're not coming, I'll see you at the theatre.
[     ]
A. Though
B. Whether
C. Until
D. Unless

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科目： 來源：山東省高考真題 題型：單選題

It was some time ______ we realized the truth.
[     ]
A. when
B. until
C. since
D. before

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