单项选择题

You can't drink alcohol（）you are at least eighteen years old in some states of the US.

A.if
B.unless
C.though
D.when

<上一题目录下一题>

热门试题

单项选择题

My father believes that interest, as well as prospects,（）important when one looks for a job.

A.is
B.was
C.are
D.were

单项选择题

Once environmental damage（）, it takes many years for the system to recover.

A、 had done
B、 is done
C、 is to do
D、 does

相关试题