题目内容

George_____havemissedtheway,Iexplainedtheroutecarefullyanddrewhimamap.

A. mustn’t
B. isn'tableto
C. couldn't
D. maynot

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Susan,you’resolazy.Thisjob_________hoursago.

A. shouldhavefinished
B. couldhavefinished
C. oughttohavebeenfinished
D. musthavefinished

Whenwereachedthepier(码头),theferryhadnotarrivedyet;sowe__________.

A. needednottohurry
B. needn’thavehurried
C. didn’tneedtohurry
D. hadnotneededinhurry

— “Did you enjoy the concert yesterday?”— “No, it was a confusion, and the band didn’t play as it __________ .”

A. did
B. used to
C. has done
D. have done

刀具磨损的初期阶段，磨损速度很快的原因是：

A. 切削温度较高
B. 切削力较大
C. 切削速度较高
D. 刀具工件接触压强较大