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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Size 10 is（）tight for my daughter. Show me a wider pair.

A．very
B．so
C．too
D．quite
单项选择题
The building（）by the end of next year will be used as our teaching block.

A．to be completed
B．completed
C．being completed
D．having been completed
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