单项选择题

The Great Wall was so wide that armies could march（）it.

A.at top of
B.on top of
C.at the top of
D.on the top of

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单项选择题
What（）all this morning？

A.are you being done
B.have you been doing
C.have you been done
D.are you doing
单项选择题
When training new project team members，you were asked what should be done during scope verification，your answer should be：（）

A.Verify product correctness.
B.Create WBS.
C.Inspection.
D.Performance measurement.
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