单项选择题

It was not until the accident happened ______ .

A．when I became aware of my foolishness
B．when my foolishness became obvious
C．that did I realize my own folly
D．that I became aware of my own foolishness

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单项选择题

______ in Beijing for quite a few years, Mr. Park had little difficulty understanding Chinese.

A．Having lived
B．Lived
C．Living
D．To live

单项选择题

Not a sound ______ while the professor was giving a speech.

A．the students utter
B．the students uttered
C．did the students uttered
D．did the students utter