who knows______ over there?A.what happensB.what is happening说明理由

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who knows______ over there?A.what happensB.what is happening说明理由

who knows______ over there?A.what happensB.what is happening说明理由
who knows______ over there?
A.what happens
B.what is happening
说明理由

who knows______ over there?A.what happensB.what is happening说明理由
B.通过说话人的语气可推测是正在发生

是A?
意思是:谁知道那个地方发生了什么?
显然已经发生过了, 用 be + doing 不合适
语感好的就 读出来了。

B