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
My friend’s flight had taken off _________ I got to the airport to see him off.
#56042
A
while
B
after
C
before
D
until
_____ he was very tired, he continued working in his office.
#55324
A
Since
B
Although
C
As soon as
D
Because
Don't worry! I'll send you an e-mail_______.
#56146
A
as soon as possible
B
as soon as possibly
C
as soon as can
D
as quick as possible