【題目】It's difficult the mountain in a day.
A.to climb
B.climbing
C.climbs
D.climbed

【答案】A
【解析】“It is +adj.+to do sth.”是固定句型,后面的動詞用帶 to的不定式,故選A。句意是:一天內(nèi)爬上這座山有困難。

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