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问题 选择题
Lucy, what             two days ago?

A. you happen
B. you happened
C. did you happen
D. happened to you
答案

答案：D

选择题

I called him to ask _______. [ ]

A. when will he come to visit me

B. whether he would come to visit me

C. how he will come to my party

D. where would he hold the party

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问答题 简答题

水准仪的使用步骤？粗平、精平如何操作？水准尺如何读数？
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