问题
选择题
It's necessary ____ us ____ wear suitable clothes on every occasion. [ ]
A. for; to
B. for; for
C. to; to
D. to; for
答案
答案：A
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It's necessary ____ us ____ wear suitable clothes on every occasion. [ ]
A. for; to
B. for; for
C. to; to
D. to; for
答案：A