单项选择题

While（）in the supermarket, I met an old friend of mine.

A． being shop
C． shopping
B． shop
D． shopped

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The day I shall never forget is the one（）I joined the Party.

A． which
C． on which
B． at which
D． in which
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By the end of last term, we（）ten units.

A． learned
B． had learned
C． has learned
D． learns
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