单项选择题

In some languages, 100 words make up half of all words______in daily conversations.

A．using
B．to use
C．having used
D．used
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单项选择题
The newly-built house is______the old one.
A．twice the size of
B．as twice big as
C．the twice size of
D．bigger twice than
单项选择题
To pay to see that movie seems foolish______you can see it on television for free.
A．before
B．though
C．when
D．once
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