【题目】They haven’t decided when __________ for Shanghai.
A.to be leavingB.to leaveC.leavingD.leave
在线课程【答案】B
【解析】
考查疑问词+不定式作宾语。句意：他们还没有决定什么时候动身去上海。decide后接“疑问词+不定式”作宾语，when to do意为“什么时候去做”。故选B项。
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