问题标题：
【Thetallbuilding____whentheearthquakehappened.用shake,shook,isshaking来填空】
问题描述：
Thetallbuilding____whentheearthquakehappened.用shake,shook,isshaking来填空
彭捍东回答：
Thetallbuilding____whentheearthquakehappened.
用shake,shook,isshaking来填空
填shook.
因为happened是过去时态,时态要一致.
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