问题
选择题
Susan's parents have bought a large house with a swimming pool. It ______ be very expensive. [ ]
A. must
B. can
C. can't
D. mustn't
答案
答案：A
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Susan's parents have bought a large house with a swimming pool. It ______ be very expensive. [ ]
A. must
B. can
C. can't
D. mustn't
答案：A