题目内容

They soon developed a very close relationship.

A. 对
B. 错

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This is an unusual opportunity that will lead your to success,

A. 对
B. 错

It is hard _old people to change their ways.

A. to
B. of
C. to
D. in

Teachers devotes themselves _the cause of aducation.

A. to
B. of
C. in
D. to

The sea covers 71% of the earth.

A. 对
B. 错