问题
选择题
David has bought a large house with a swimming pool. It _____ be very expensive. [ ]
A. must
B. can
C. mustn't
D. can't
答案
答案：A
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David has bought a large house with a swimming pool. It _____ be very expensive. [ ]
A. must
B. can
C. mustn't
D. can't
答案：A