问题
选择题
Classes begin________eight________the morning.[ ]
A. in; at
B. on; to
C. at; in
D. to; on
答案
答案：C
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Classes begin________eight________the morning.[ ]
A. in; at
B. on; to
C. at; in
D. to; on
答案：C
的分子式是：C7H12O