the only thing to do was ask him to come.
题目
the only thing to do was ask him to come.
为什么不是the only thing to do was to ask him to come或the only thing to do was asking him to come.
能否再说明白一点？
答案
我来告诉你把.你可以把句子变成(The only thing to do) was that (ask him to come )
that 后面必须要跟一个完整的句子,而没有主语要想成为一个句子则必须用祈使句,所以是ask him to come
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