【題目】Mark and Mike ______ in the library an hour ago. Now they ______ in the classroom.

A. are; are B. were; were C. are; were D. were; are

【答案】D

【解析】第一個句子中“an hour ago”意為“一小時之前”，用于一般過去時態(tài)；第二個句子中“now”意為“現(xiàn)在”，用于一般現(xiàn)在時態(tài)或現(xiàn)在進(jìn)行時態(tài)。

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