—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
Frank often wears a mask _____ he can keep fit in the foggy and hazy (霾) weather.
#55316
A
only if
B
until
C
so that
D
even though
—May I go out to play soccer ball?—I’m afraid not. You can’t play __ you have finished your homework.
#56921
A
after
B
when
C
of
D
unless
– This dress was last year’s style.– I think it still looks perfect ________ it has gone out of fashion this year.
#56046
A
so that
B
as if
C
ever since
D
even though