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问题

Why didn’t you go to yesterday’smeeting—I would have but I ______ too busyworking on the important experiment

A:have polluted
B:is being polluted
C:has been polluted
D:have been polluted
正确答案是:
同类题型

“Mary, don’t take it ______ when your teacher makes some general and unpopular remarks in class Just try your best”, said her mother

Look! The girl with long hair is drawing a picture. Is she Sandy— It ______ be her. I’m not sure.

It was several minutes before I was ______of what was happening

Let’s go swimming, Millie.— Sorry, I have ______ homework to do.

Itis often that humanbeings are naturally equipped to speak.

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