单项选择题

Not until my British friend came to China（）how densely populated the country is.

A．did he realize
B．he didn't realize
C．he realized
D．he could realize

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The difference in time between zones is（）

A．twenty-four hours
B．seven days
C．one hour
D．more than seven days
单项选择题
Size 10 is（）tight for my daughter. Show me a wider pair

A．very
B．so
C．too
D．quite
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