单项选择题

Mike was walking along the street（）he ran into an old friend.

A. who
B. when
C. which
D. whom

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单项选择题

Although their lives changed, they（）continued writing to one another.

A. ever
B. never
C. still
D. rather

单项选择题

My little son has not learned how to（）the time yet.

A. see
B. know
C. understand
D. tell

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