题目内容
【题目】The lab ________ about five years ago.
A. built B. is built C. was built D. has been built
【答案】C
【解析】句意：那个实验室大约在五年前被建造的。根据about five years ago可知此处用一般过去时，主语the lab与谓语build之间是被动关系，故谓语用被动语态，故选C。
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【题目】The lab ________ about five years ago.
A. built B. is built C. was built D. has been built
【答案】C
【解析】句意：那个实验室大约在五年前被建造的。根据about five years ago可知此处用一般过去时，主语the lab与谓语build之间是被动关系，故谓语用被动语态，故选C。