题目内容

过分追求成功很容易导致一个人的自我挫败。

A. 对
B. 错

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I haven't met him for ages, but his mother ______ him every day.

A. had seen
B. sees
C. has seen
D. saw

The city ______ great changes in the past five years.

A. sees
B. has seen
C. saw
D. had seen

It is not long before the water ________cold.

A. is feeling
B. felt
C. was feeling
D. feels

有无穷多个向量组成的集合称为为向量空间。

A. 对
B. 错

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