题目内容

氯霉素或抗肿瘤药所致的骨髓抑制，属于E．

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I have to______my visit as I' 11 be very busy next week.

A. call for
B. call on
C. call off
D. call in

______ how to operate a switchboard, I had to ask the office supervisor to show me the correct procedures.

A. Not known
B. No to know
C. Not knowing
D. Having not known

戒毒药品处方应保留E．

It's already five o' clock now. Don't you think it's about time______？

A. we are going home
B. we go home
C. we went home
D. we can go home