单项选择题

Wind and rain continually hit against the surface of the Earth, ______ large rocks into smaller and smaller particle.

A．to break
B．would break
C．breaking
D．broken
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单项选择题
The ______ salary of the staff is about ＄ 50.
A．usual
B．average
C．equal
D．common
单项选择题
The villagers were very ______ for what those soldiers had done for them.
A．grateful
B．regretful
C．gradual
D．graceful
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