问题
选择题
I'm sorry, but I really don't know __________ the clock.[ ]
A. to mend
B. how to mend
C. what to mend
D. how should I mend
答案
答案：B
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I'm sorry, but I really don't know __________ the clock.[ ]
A. to mend
B. how to mend
C. what to mend
D. how should I mend
答案：B