A. must be
B. should be
C. must have been
D. would have been
第1题
He is finally determined to quit smoking for he knows that it may_________ hishealth.
A) ensure
B) persecute
C) jeopardize
D) assure
第2题
We’ve done a lot of work and we ______ a break.
A) are worth
B) are worthy of
C) are valuable of
D) deserve
第3题
We will be exploring different approaches _______information.
A) gathering
B) in gathering
C) to gathering
D) to gather
第4题
We must work hard to____ a good knowledge of English.
A) inquire
B) acquire
C) require
D) quire
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