单项选择题

Liquid water changes to vapor, __ is called evap

A．which
B．
C．what
D．that
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单项选择题
My grandfather has decided to make me go back to college immediately, study my lessons carefully, and. __
A．attain my master's degree
B．a master's degree must be attained
C．must attain my master's degree
D．to my master's degree I have to attain
单项选择题
It's very nice __ you to help me.
A．for
B． in
C．like
D． of
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