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检测·课时达标l 知能达标演练
Ⅰ. 单项填空
1.（2012·太原高一检测）—Sorry，Professor Smith. I didn’t finish the paper yesterday.
—Oh，you _______ have done it as yesterday was the deadline.
A. must B. mustn’t C. should D. shouldn’t
2.（2012·济南高一检测） Shopping online can save much time as you _______ go to a shop or walk around crowded shopping centers.
A. don’t have to B. oughtn’t to C. won’t D. mustn’t
3. Since he could easily finish the work himself, he _______ his friends for help.
A. should have asked B. could have asked
C. couldn’t have asked D. needn’t have asked
