单项选择题

Ice and snow ______ houses near the North pole.

A．used to build
B．are used to building
C．are used to build
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单项选择题
Linda plays ______ tennis. She also plays ______ piano.
A．the.../
B．/...the
C．the...the
单项选择题
The iron ball is too heavy for me ______.
A．to rise
B．to rise it
C．to raise
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