单项选择题

Only when (it started) to rain (he noticed) that he (had left) his raincoat (somewhere).

A．it started
B．he noticed
C．had left
D．somewhere
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单项选择题
You (will not able) to pass the examination (unless) you work (harder) than you (do) now.
A．will not able
B．unless
C．harder
D．do
单项选择题
He was (so) excited after hearing the news (and) he (could not) fall asleep (immediately).
A．so
B．and
C．could not
D．immediately
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