问题
Why, my new computer is rubbish! Five hours has passed and it still hasn’t finished the downloading.—Don’t worry. You know, sometimes the Internet ________ be very slow.[ ]
A: can
B: may
C: should
D: must
B: may
C: should
D: must
正确答案是：
同类题型
That’s the new machine ______ parts are too small to be seen
Having worked nonstop for three hours in the sun, John returned home, ______.
for your timely warning, we _____ into great trouble.— Well, you know we’re friends.
ering your salary, you should be able to____ at least twenty dollars a week.