Although James Cook   the first westerner to have discovered Australia,New Zealand and Hawaii,his travels led to the creation of more accurate and reliable maps for vast parts of the world.
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A
isn’t
B
wasn’t
C
must have been
D
may not have been
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It is recommended by the representatives that traditional cultures _____
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A
should preserve
B
have been preserved
C
be preserved
D
must be preserved
You       very fast if you went from New York to Boston in six hours.
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A
should drive
B
must have driven
C
may drive
D
would have driven[
(2009·江苏高考)He did not regret saying what he did but felt that he________it differently.
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A
could express
B
would express
C
could have expressed
D
must have expressed