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问题: 求救!!!一道英语单选

I think father would like to know ____I've been up to so far,so I decede to send him a quick note.
A.which B.why C.what D.how

解答:

答案是C. up to 需要宾语,在名词性从句中,what(指物)做主语,宾语,表语.