单项选择题


A．when
B．then
C．where
D．and
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单项选择题
A．rarelyB．oftenC．alwaysD．occasionally
A．rarely
B．often
C．always
D．occasionally
单项选择题
A．YetB．HoweverC．SoD．Instead
A．Yet
B．However
C．So
D．Instead
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