问题补充:
A foreign language like English is difficult to learn, so you work too hard.
A. can’t
B. must
C. shouldn’t
D. ought to
答案:
(答案→)A. can’t
B. must
C. shouldn’t
D. ought to
解析:考查情态动词:can’t/couldn’t….too….,在…也不为过,其他情态动词没有这个用法,句意:向英语这样的外语很难学,所以你再努力也不为过。选A。