问题
选择题
He is going camping _____ 6:00 _____ the morning of July 21st. [ ]
A. in; on
B. on; at
C. at; on
D. at; in
答案
答案：C
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He is going camping _____ 6:00 _____ the morning of July 21st. [ ]
A. in; on
B. on; at
C. at; on
D. at; in
答案：C