. Sales of CDs have greatly increased since the early 1990s, when people ________ to enjoy the advantages of this new technology.
#104797
A
begin
B
began
C
have begun
D
had begun
推荐题目
---- Flight 551 for Dallas ________. I must be off now. ------Have a pleasant trip then.
#102346
A
is being announced
B
has announced
C
was announcing
D
had been announced
—What do you think of our country?—Very beautiful.You know it is the first time that I here.
#101729
A
will be
B
was
C
have been
D
had been
The father as well as his daughters _____ skating on the freezing river every Sunday afternoon.
#102582
A
go
B
goes
C
is going
D
are going
—I’m going to see John tomorrow.—Don’t tell him the result of his medical examination when you __________ to him.
#99818
A
talk
B
have talked
C
will talk
D
talked
---How can you keep slim as a mother of two sons?---I _______ in the gym for years.
#102426
A
have worked out
B
have been working out
C
have worked on
D
have been working on