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
Both Tom and Mary ______ the exam. ( )
A．has passed
B．have past
C．have passed
D．had passed
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
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