She did nothing _______ at the photo.
A. except look
B. but to look
C. except to look
D. but looking
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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
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