问题
选择题
When did you plan _____ to Singapore _____ last Sunday. [ ]
A. to fly, on
B. to fly, /
C. flying, in
D. flew, at
答案
答案：B
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When did you plan _____ to Singapore _____ last Sunday. [ ]
A. to fly, on
B. to fly, /
C. flying, in
D. flew, at
答案：B