问题
选择题
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
答案
答案：A
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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：A