问题描述：
I can't decide____to buy a nwe bike or ___a used one.
A.when ,find
B.whether,to find
C.how,look for
D.why ,to look for
选什么?理由?whether什么意思?
A.when ,find
B.whether,to find
C.how,look for
D.why ,to look for
选什么?理由?whether什么意思?
问题解答：
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