D has happened
do you think 是插入语.可以拿掉不影响句子结构.
故A项结构不完整,B项少了is C项错误,happen无被动
选D what has happened 发生了什么
there are many people downstairs .what do you think ____ Ato happen B happening Cis happened Dhas
there are many people downstairs .what do you think ____ Ato happen B happening Cis happened Dhas
英语人气：869 ℃时间：2019-08-19 06:41:06
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