问题

A friend is a person who knows what you are saying ______ you are not talking.
A:because
B:until
C:unless
D:even if;
B:until
C:unless
D:even if;
正确答案是:
同类题型
id you like the concert lastnight— I enjoyed it very much, but the dancers______ a better job.
Only by increasing the number of doctors by 50 percent ____ properly in this hospital.
Amy is ______ a careful girl that she made ________ mistakes in her last exam.
Though Sundays are ______ as a day for rest, we must make good use of them.[ ]