4、--I haven't heard from Li Jun for a long time.

--What do you think _______ to him?

A.was happening                                 B.to happen

C.had happened                                     D.has happened

4、D

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--I haven't heard from Li Jun for a long time.

--What do you think _______ to him?

A.was happening                                 B.to happen

C.had happened                                     D.has happened

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