. 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
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It _______ long before we ______ the result of the experiment.
#103038
A
will not be; will know
B
is; will know
C
will not be; know
D
is; know
I called Mary many times yesterday evening, but I couldn’t get through. Her brother _________ on the phone all the time.
#101197
A
was talking
B
has been talking
C
had talked
D
talked
--- I’m sure Andrew will win the first prize in the final. --- I think so. He _____ for it for months.
#103307
A
is preparing
B
was preparing
C
had been preparing
D
has been preparing
When I met him the other day，it was the first time we ________ each other since we were at school.
#99162
A
saw
B
had seen
C
were seeing
D
have seen