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【单选题】

When the teacher came into the classroom, all of us __________ the classroom.

A.
are cleaning
B.
were cleaning
C.
cleaned
Dare cleaned
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参考答案:
参考解析:
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举一反三

【单选题】It ________ me around one hour ________ the subway. [ ]

A.
takes, take
B.
take, takes
C.
takes, to take
D.
takes, taking