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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1.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

2.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

3.單項(xiàng)選擇題I （） help. I can do it myself.

A.need    to
B.don’t    need
C.needn’t
D.need

4.單項(xiàng)選擇題Since the road is wet,（） last night.

A.it   must   have  rained
B.it   must   rain
C.it   must   be    raining
D.it   must   have   been  raining

5.單項(xiàng)選擇題（）that it was raining, he put on his raincoat.

A.See
B.To see
C.Saw 
D.Seeing