单项选择题

During the ______ farmers took all the troubles to irrigate their crops.

A．draught
B．naught
C．fraught
D．drought
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单项选择题
Water enters into a great variety of chemical reactions, ______ have been mentioned in previous pages.
A．a few of it
B．a few of that
C．a few of them
D．a few of which
单项选择题
The survey found that Hungary ______ as the most environment-conscious country of East Europe.
A．broke out
B．held out
C．ran out
D．stood out
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