题目内容

_____ , I couldn’t lift the box.

As I might try
B. As try I might
C. Try as I might
D. Try though I might

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Rarely _____ such a silly thing.

A. have I heard of
B. I have heard of
C. have I been heard of
D. I have been heard of

So instructive _____ that the students wanted to see it again.

A. was the film
B. it was the film
C. the film was
D. the film it was

Seldom _____ any mistakes during my past five years of teaching in this university.

A. would I make
B. I did make
C. should I make
D. did I make

以下说法正确的是( )。

A. 数据清洗是一次性工作,只需完成一次
B. 数据来源具有多样性,无需进行关联性验证
C. 数据清洗时需要先观察数据
D. 数据中有缺失值的字段可以直接删除