问题
选择题
Is Linda free _____ 7 o'clock _____ next Sunday morning?
A. in; at
B. at; on
C. in; /
D. at; /
答案
答案：D
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Is Linda free _____ 7 o'clock _____ next Sunday morning?
A. in; at
B. at; on
C. in; /
D. at; /
答案：D