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單項(xiàng)選擇題

Don't disturb me. I（）letters all morning and have written ten so far.

A.write
B.have written
C.was writing
D.have been writing

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單項(xiàng)選擇題

I’ve come to ask him for the book. That’s why I （） wait until he comes back.

A.need
B.should
C.oughtto
D.have to

單項(xiàng)選擇題

Mr. Baker, a dozen students want to see you. （） they wait here or outside?

A.Should
B.Will
C.Shall
D.Are