—What’s the matter with you? You look so worried.-- I don’t know ___________ the problem.
#57173
A
what to solve
B
how to solve
C
to solve what
D
how can I
推荐题目
Martin and his friends didn’t eat up all the food they ordered, __ they took the rest away.
#57634
A
for
B
or
C
so
D
as
