题目内容：

32.True friendship is like sound health,whose value is seldom known_______it is lost.C.until D.unless
26.We are ensured that there are enough textbooks for each student to have _______ when the new semester comes.
A.it C.one
27.— She looks very happy.She _______ have passed the exam.
— I guess so.It’s not difficult after all.
C.must D.might
38.— Did you take enough money with you?
— Yes,but I spent _______ I had expected.
A.not so many as B.as many as C.much more than D.much less than
34.Many experts believe that teachers’ development is _______ the key to better education lies.A.that B.what C.where D.which
两个选项的说明那个错的为什么错