Question

【题目】After class, I have gymnastics _________ .

A. At two hours B. for two hours C. for a hour D. at an hour

Answer 1

【答案】B

【解析】

句意：课下，我上了两小时体操课。

for two hours长达两小时，hour是元音音素开头，故用不定冠词an修饰，for an hour长达一小时。故选B。