—Tom isn’t feeling very well.  —He seems to have a cold      the weather changes suddenly.
#55789
A
before
B
so
C
because
D
if
推荐题目
You can’t get off the bus ___________ the bus stops. 
#55501
A
after
B
when
C
until
D
because
Bill is a true friend,          I didn’t like him at the        .
#57033
A
but, beginning
B
or, end
C
and, end
D
and, beginning
We can’t go out for a walk _______ the bad weather.
#56819
A
because of
B
because
C
about
D
so