题目内容

John, you must get your room ________ after breakfast.

A. to be cleaned
B. to clean
C. cleaning
D. cleaned

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旋转变换、投影变换、和伸压变换都是线性变换

A. 对
B. 错

The problem _______ at tomorrow’s meeting is a very difficult one.

A. being discussed
B. discussed
C. to be discussed
D. to discuss

若同维向量a和向量b对应的分量相等,则a与b相等吗

A. 对
B. 错

He reached the station _ only _ that the train had just left.

A. tired；learned
B. tiring；learning
C. to tire；to learn
D. tired；to learn