单项选择题

He was a good swimmer, so he （） swim to the river bank when the boat sank.

A．could
B．might
C．succeeded to
D．was able to

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单项选择题
She showed him the photo she （）the day before.

A．has taken
B．took
C．was taking
D．had taken
单项选择题
Both Tom and Mary （）the exam.

A．has passed
B．have past
C．have passed
D．had passed
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