I'm very sorry to keep you _so long. I h

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问题选择题

I'm very sorry to keep you _ so long. I have something important to do. [ ]

A. wait

B. waiting

C. waiting for

D. waited

答案

答案：B

选择题

Someone who lacks staying power and perseverance is unlikely to ______ a good researcher. [ ]

A. make　　　　　　　　

B. turn

C. get

D. grow

单项选择题

当混合使用分别以次氯酸和盐酸为主要成分的两种洗净剂时，所产生的有害于健康的污染物质主要是什么？（）。

A.氯酸

B.盐酸

C.次氯酸根

D.氯气

E.环境激素