单项选择题

I () have written to him because he phoned me shortly afterwards.

A.ought to
B.must
C.couldn't
D.needn't

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() other nurses, Alice is careful and patient.

A.Looking like
B.Compared with
C.If, common with
D.As to
单项选择题
At the()of the bell, the students rushed into the classroom.

A.sight
B.noise
C.voice
D.sound
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