问题

To our surprise, at the back of the classroom ______ many teachers from different parts of the city.

A:sits
B:are sitting
C:sat
D:were sitting

正确答案是：

同类题型

下列词语中没有错别字的一组是（）

_____ did you ________the summer vacation — It was terrible . I have too much homeworkto do .

20________of both sides, the two companies decided to _______ to become more competitive in the global market

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owd is too noisy, but anyway I haveto make myself ______ to them because the news is so important to them