◎ 题干
Don't worry. They'll come to help us _______.
[     ]
A. in half an hour
B. in a half hour
C. after half an hour
D. after a half hour
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“Don't worry. They'll come to help us _______.[ ]A. in half an hour B. in a half hour C. after half an hour D. after a half hour…”主要考查了你对  【介词短语】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。