问题补充:
We haven settled the problem of it is necessary for him to study abroad.
A. why
B. whether
C. what
D. how
答案:
A. why
(答案→)B. whether
C. what
D. how
解析:B 考察宾语从句。此处的whether是否,引导一个宾语从句作为介词of的宾语。
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