题目内容

【题目】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】第一个句子中an hour ago意为一小时之前,用于一般过去时态;第二个句子中now意为现在,用于一般现在时态或现在进行时态。

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