单项选择题

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A.At the bookstore.
B.At the library.
C.At the travel agency.
D.At the hospital.
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单项选择题
A.Yes, I did.B.No, I didn’t.C.It was a waste of time.D.It lasted two hours.
A.Yes, I did.
B.No, I didn’t.
C.It was a waste of time.
D.It lasted two hours.
单项选择题
If we had known the basic principles, we should have controlled the process even better.
A.如果我们认识这些基本理论,我们就能更好地控制这个程序了。
B.假如我们了解这些基本原理,我们应该早点控制这个过程。
C.如果我们见过这些基本理论,那么我们必须更早一点控制这个程序的使用。
D.如果我们早知道这些基本原理,我们就会更好地控制这个程序了。
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