问题补充:
—Where Margaret have put the empty bottles?
—She them away. They must be somewhere.
A. can; can’t have thrown
B. must; needn’t
C. must; must have thrown
D. can; must throw
答案:
(答案→)A. can; can’t have thrown
B. must; needn’t
C. must; must have thrown
D. can; must throw
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