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Could you finish the task in two days? 一（）I have something else to do these days．

A.I could not
B.Yes．I think so
C.I'm afraid so
D.I'm afraid not

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Could you buy some salt on your way home? （）

A.All right.
B.Is that all?
C.Just a few.
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Could I use your bike for a moment?（）

A.It's well.
B.It doesn't matter.
C.By all means
D.I have no idea.

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