问题
选择题
—The charity walk begins _______ 9.00 a.m. Don't be late.
—No problem.[ ]
A. in
B. at
C. on
D. to
答案
答案：B
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—The charity walk begins _______ 9.00 a.m. Don't be late.
—No problem.[ ]
A. in
B. at
C. on
D. to
答案：B