问题
选择题
What he wants is _______ his mother as quickly as he can; and what he must do is ____ to the hospital at once．
A．to see; going
B．to see; go
C．see; to go
D．see; go
答案
：B
：考查不定式做表语。当主语中含有do的某种形式时，做表语的不定式符号to可以省略。第一空前的主语没有do的形式，所以使用不定式做表语。第二空前的主语中有do,故不定式符号to可以省略。故B正确。