单项选择题

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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单项选择题

By the end of last term, we（）ten units.

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

单项选择题

It is known to all（）discovered the America continent.

A.how
C.who
B.when
D.why

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