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16)She can speak quite fluent English. She____.
A)must been in the U.S.A. for some time
B)must have been in the U.S.A. for some time
C)should have been in the U.S.A. for some time
D)May be in the U.S.A. for some time
17)You should bear in mind that he is not so strong as he____.
A)was used to be
B)used to be
C)was used to
D)use to
18)“We didn't see him at the exhibition yesterday.”“He ___it.”
A)mustn't visit
B)can't have visited
C)should have gone to see
D)may see
19)Mary ____my letter,otherwise she would have replied before now.
A)should have received
B)has received
C)Couldn't have received
D)ought to have received
20)I ____ you a valuable present for your birthday,but I was short of money.
A)would have liked to give
B)liked to give
C)have liked to give
D)would like to give
答案：BBCCA
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