题目内容

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

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All the walls were ______ with pictures.

A. hang
B. hanged
C. hanging
D. hung

He ______ not work hard that was why he failed in the exam.

A. did
B. was
C. does
D. is

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．

She ______ down and soon fell asleep.

A. live
B. lay
C. laid
D. lain