单项选择题

Many teakettles whistle when the ______ starts to boil.

A．containing water inside
B．water contained inside
C．water containing inside
D．contain water
<上一题 目录 下一题>
热门 试题

单项选择题
More has been learned since 1945 about the chemical changes in the body than in all human history before ______ time.
A．in
B．that
C．which
D．the
单项选择题
He was told he could join the army when he ______ old enough.
A．would be
B．should be
C．was
D．were
相关试题