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高二下册《Project： Waste》优秀ppt课件
A. must B. can C. need D. may
2.It has been announced that candidates(候选人)
____ remain in their seats until all the papers
have been collected.
A. can B.will C. may D. shall
3.--I heard they went skiing in the mountains last
winter.
--It ____ true because there was little snow there.
A. may not be B. won’t be
C. couldn’t be D. mustn’t be
情态动词
表示推测
不表示推测
can could
may might
shall should
must
will would
ought to
have to
dare (daren’t)
need (needn’t)
used to
I daren’t ask her for a rise. 我不敢请求她加薪.