单项选择题

Only by listening, speaking, reading and writing ______.

A．can English be mastered
B．can we master English
C．English can be mastered
D．we can master English
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单项选择题
To be an inventor, one needs profound knowledge as well as a very ______ imagination.
A．vivid
B．bright
C．living
D．colorful
单项选择题
He would certainly have got there on time ______.
A．had he not had a flat tire
B．if he didn't get a flat tire
C．if the flat tire hadn't happened
D．had the tire hadn't flattened itself
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