问题
选择题
Jeff can't come to the party, because he'll help his sister with the housework. [ ]
A. must
B. have to
C. has to
D. needs to
答案
答案：B
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Jeff can't come to the party, because he'll help his sister with the housework. [ ]
A. must
B. have to
C. has to
D. needs to
答案：B