问题标题:
【Idon'tknow_______yesterday.A.WhathehappenedB.WhatdidhehappenC.WhathappenedtohimD.Whathashappened(要理由)】
问题描述:

Idon'tknow_______yesterday.

A.Whathehappened

B.Whatdidhehappen

C.Whathappenedtohim

D.Whathashappened

(要理由)

沈艳霞回答:
  选C.Whathappenedtohim   首先分析句势结构,由于know是及物动词,后跟what引导的宾语从句,从句中要用陈述语气,故排除B与D   接下来分析happen的句式结构   有句形:sth.happentosb.   what即为这里的sth.   故而排除A选C
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