Sales of CDs have greatly increased since the early 1990s, when people_____to enjoy the advantages of this new technology.
#104613
A
begin
B
began
C
have begun
D
had begun
推荐题目
The news came as no surprise to me. I _____ for some time that the factory was going to shut down.
#104998
A
had known
B
knew
C
have known
D
know
Jessica ought to stop work.She has a headache because she _______ too long.
#99504
A
read
B
is reading
C
had read
D
has been reading
Peter has gone to Beijing, but I’m wondering why he ________ in such a hurry.
#99812
A
left
B
has left
C
leaves
D
was leaving
If he _______, don’t interrupt him.
#102446
A
still works
B
is still working
C
still had been working
D
will still be working