单项选择题

I really don't know ______.

A． when started
B． when to start
C． when start
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单项选择题
Vegetables, eggs and meat ______ in this shop.
A． sold
B． is sold
C． are sold
单项选择题
Please come to my home ______ you are free tomorrow.
A． so
B． or
C． if
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