19.---______ ---Sorry,I don’t know.A.What do you think happe

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19.---______ ---Sorry,I don’t know.A.What do you think happen to Mary?
B.What do you think has happened to Mary?
C.Do you think what has happened to Mary?
D.Do you think what did it happen to Mary?
B,C不清楚哪个对?

你好!
这道题应该选B.
从语法结构来看,B、C选项单独语法没有错误.
B选项中do you think 在是插入语,只为加强语气.插入语去掉后原本句意不变.类似还有believe、imagine、propose、say、suppose、guess、consider、suggest等.
C选项中do you think是主句,think是谓语,而what has happened to Mary是what引导的宾语从句.一般疑问句都可以用Yes or No来回答,本题显然不可以,若将think换成know就可以.
主要还是由于"你认为谁/什么"的汉语结构对我们的影响,表达“你觉得谁/什么”应该是who/what do you think而不是do you think who/what.
你可以查阅相关资料关于双重疑问句.

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