Since the road is wet this morning,___ last night.
(a) it must rain
(b) it must be raining
(c) it must have rained
(d) it must have been rain
前面 since the road is wet this morning, 所以我們就知道昨晚一定有下過雨
前面那一句是現在式, 所以我們要用must have + 過去分詞
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