英语几道题求解 关于IT的用法17.Which sentence is wrong? A.I felt it impos

英语几道题求解 关于IT的用法
17.Which sentence is wrong?
A.I felt it impossible for him to take the exam.
B.I found it impossible that he might take the exam.
C.I thought that he might not take the exam.
D.In my opinion he might take the exam.
18.I don't think difficult for a Chinese student to master a foreign language within five years
A.that B.it C.too D.very
19.It's the second time you late this week.
A.arrive B.arrived C.have arrived D.had arrived
20.It will not be we meet again.
A.long before B.before long
C.soon after D.shortly after
这几道题我都选错了 不知道是什么原因帮忙解释下吧