题目内容

When we ______ to the village, it was very late.

A. arrived
B. reached
C. got
D. landed

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______ (Would, Should) you be so kind as to look after my baby while I am away

All the walls were ______ with pictures.

A. hang
B. hanged
C. hanging
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He ______ not work hard that was why he failed in the exam.

A. did
B. was
C. does
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设a1，a2，…，an是一组n维向量，已知n维单位坐标向量e1，e2，…，en能由它们线性表示，证明a1，a2，…，an线性无关．