问题补充：
It is to rain this afternoon.
A. likely
B. possible
C. probable
D. possibly
答案：
(答案→)A. likely
B. possible
C. probable
D. possibly
解析：考查短语：很可能做某事be likely to do，possible和probable后不跟不定式，possibly是副词可排除，所以选A。
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