Mountain climbing ________ be very tiring, and many people feel sick ________ the atmosphere gets thinner.
#31554
A
may; while
B
can; as
C
must; though
D
should; for
推荐题目
My last lesson in French! I hardly know how to write, _______ I would never learn now .
#79902
A
but
B
and
C
if
D
so
Some students even have no idea of they are studying, so they are aimless most of the time.
#30606
A
who
B
when
C
where
D
why
-- Will you lend your MP4 player to Jack?-- Yes, ________ he promises to return it on time.
#34116
A
as soon as
B
as well as
C
as long as
D
as far as