题目内容

I asked him to _______ me a few minutes so that we could go over all the problems.

A. spend
B. spare
C. save
D. share

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二维向量空间为

A. 数轴
B. 空间
C. 平面
D. 无几何意义

They won’t let their teacher _______ in that way.

A. to be treated
B. treated
C. being treated
D. be treated

矩阵的初等变换包括

A. 初等行变换
B. 初等列变换
C. 数乘
D. A和B

John, you must get your room ________ after breakfast.

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