Criticism and self-criticism are necessary __________they may help us to find out and correct our mistakes.
A. by that
B. at that
C. on that
D. in that
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It was not until dawn__________ the snowcapped peak in the remote area in Tibet.
A. that they sighted
B. did they sight
C. that they did not sight
D. had they sighted
The children lined up and walked out（）.
A. in person
B. in private
C. in order
D. in progress
居社区获得性肺炎首位的是支原体肺炎。()
参考答案：错误
We‘d better make a clear __________between competence and performance for the convince of
A. separation
B. division
C. distinction
D. difference
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