单项选择题

I will never forget Mary, （） I saw her only once.

A．though
B．before
C．while
D．as

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单项选择题

Thetwostrangersmet（）inBeijingandgotmarriedonemonthlater.

A．by chance
B．by rule
C．in turn
D．in vain

单项选择题

Tomtogetherwithhisfriends（）toplaybasketballeverySundayafternoon.

A．go
B．goes
C．has gone
D．have gone

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