问题补充：
–My sister hasn’t received any reply from the company yet, so she wants to give up.
-- My advice is that she till next week.
A. has been waiting
B. waits
C. wait
D. will wait
答案：
A. has been waiting
B. waits
(答案→)C. wait
D. will wait
解析：考查虚拟语气。The advice is that sb (should) do sth.是虚拟语气的一个句型。Should可以省略。C选项前面省略了should.
