12、——Look! What is _______ over there?

——Oh,dear! A lady was knock down by a  motorcycle.Let’s call ___ at once.

A.happened,122  B.happening,120  C.happened,110  D.happening,119

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——Look! What is _______ over there?

——Oh,dear! A lady was knock down by a  motorcycle.Let’s call ___ at once.

A.happened,122  B.happening,120  C.happened,110  D.happening,119

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