The past 30 years__________ the great changes that have taken place in my hometown.
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A
saw
B
was seen
C
have seen
D
see
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—When are you leaving for Guangdong?—My plane        at six.
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A
took off
B
would take off
C
will take off
D
takes off
Opposite my school _______ a book store, _______ was built ten years ago.
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A
is standing, which
B
stood, it
C
stands, which
D
stands, that