If _____ unsolved, this may lead to more serious problems.

A. making
B. remained
C. left
D. taking
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科目：高中英語 來源：江西省同步題 題型：單選題

If _______ unsolved, this may lead to more serious problems.
[     ]
A. making
B. remained      
C. left
D. taking

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科目：高中英語 來源：吉林省模擬題 題型：單選題

If _____ unsolved, this may lead to more serious problems.
[     ]
A. making
B. remained
C. left
D. taking

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