Frank often wears a mask ________he can keep fit in the foggy and hazy (霾) weather.
#55993
A
only if
B
until
C
so that
D
even though
推荐题目
It       Yang Liwei about 21 hours       the earth 14 times in his spaceship.
#57516
A
spent; circling
B
took; traveling
C
spent; to travel
D
took; to circle
--Lucy is doing her homework. ---Let’s ask Lily _______.
#58314
A
but
B
except
C
instead
D
instead of