选择题 All of them wondered when-------- A. they can set off B. can they set off C.to set off答案 给的是C,when to set off。谁能给我解释一下

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选择题 All of them wondered when-------- A. they can set off B. can they set off C.to set off
答案 给的是C,when to set off。谁能给我解释一下

C
如果选A,可以改为 they could set off
因为主句的动词是过去式wondered ,从句时态要与之保持一致.

答案选C when to set off
如果选A,应为 they could set off
主句的动词是过去式wondered ,从句时态要与之保持一致。

你好。答案是C
A的时态不对,can要变成could就对了。
wonder when to set off ------想知道何时出发