—What’s the matter with you? You look so
问题:
—What’s the matter with you? You look so worried.
-- I don’t know ___________ the problem.
A.what to solve
B.how to solve
C.to solve what
D.how can I
—What’s the matter with you? You look so worried.
-- I don’t know ___________ the problem.
A.what to solve
B.how to solve
C.to solve what
D.how can I