问题
选择题
If you don't know the answer ________ something, you______say "I'm sorry." [ ]
A.of;must
B. to;may
C. to;will
D. of; can't
答案
答案：B
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If you don't know the answer ________ something, you______say "I'm sorry." [ ]
A.of;must
B. to;may
C. to;will
D. of; can't
答案：B