题目内容

Where _ you __ this morning?

A. did; been
B. had; be
C. had; been
D. had; being

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What's the correct expression of 化妆包?

A. cosmetics
B. cosmetic
C. cosmetics cases
D. cosmetic case

Excuse me, did you see _______ keys?

A. a set of
B. a set
C. sets of
D. sets

I thought that the room attendant _________ where they went.

A. might see
B. might have seen
C. might saw
D. might have saw

动态滤波是（）。

A. 补偿不同深度的衰减
B. 频率可控的选频网络