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单项选择题

They are talking vigorously about the people and countries ______ they had visited.

[A] which
[B] that
[C] what
[D] where
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单项选择题He ______ the upper hand in the competition but, at that time, he gave rein to his emotions and ruined the game.

[A] had to take
[B] might have taken
[C] might take
[D] must have taken