(2013·高考辽宁卷)He was unhappy when he sold his guitar.After all，he ________it for a very long time.
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A
has had
B
had had
C
has
D
had
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Many parents __________ challenging conversations with their children later this month to help them recover from the panic.
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A
have had
B
will be having
C
have
D
will have had
—I don’t think you can manage it. —That __________!
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A
will all depend on
B
will all depend
C
all depends
D
all depends on
The new generation of computers, with artificial intelligence, _______and perfected now.
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A
are being developed
B
have developed
C
developed
D
will develop
—How can I apply for an online course?—Just fill out this form and we _______ what we can do for you.
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A
see
B
are seeing
C
have seen
D
will see
In the last twenty years, seven Canadian scientists _____ the Nobel prize!
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A
won
B
had won
C
was winning
D
have won