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
推荐题目
–What was your brother doing at this time yesterday?-- He was reading a magazine ________ I was writing an e-mail at home.
#55135
A
as soon as
B
after
C
until
D
while
--I think your father is very busy.--So he is._______ he still takes a walk with us sometimes.
#57621
A
So
B
And
C
Or
D
But
David didn’t give up ______ he had failed in the experiment four times.
#58224
A
if
B
while
C
though
D
since