单项选择题

I'm sure the letter won't arrive in time（）it is sent by air.

A．if
B．until
C．because
D．unless

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单项选择题
If（）to a high temperature, ice will change to water.

A．heating
B．being heated
C．to heat
D．heated
单项选择题
I have two elder brothers,（）in the army for ten years.

A．the elder of whom served
B．the older having served
C．the older of which served
D．the elder one has served
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