问题
选择题
We are going for a picnic tomorrow. I'll call Wendy to make sure ______. [ ]
A. why to start
B. when to start
C. what to start
D. which to start
答案
答案：B
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We are going for a picnic tomorrow. I'll call Wendy to make sure ______. [ ]
A. why to start
B. when to start
C. what to start
D. which to start
答案：B