单项选择题

We must be () our guard against this kind of disease.

A.on
B.in
C.with
D.for

<上一题 目录 下一题>
热门 试题

单项选择题
Do they have () air-conditioners for cooling the rooms in hot seasons

A.many a
B.enough
C.a great deal of
D.a hit of
单项选择题
I have no objection () his staying in the classroom as long as he keeps quiet.

A.of
B.to
C.in
D.over
相关试题