单项选择题

It was when we were returning home ______ I realized what a good feeling it was to have helped someone in trouble.

A．which
B．that
C．where
D．how
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单项选择题
You ______ read that article if you don t want to.
A．haven"t
B．can"t
C．mustn"t
D．needn"t
单项选择题
Mrs. Smith, together with her friends, ______ to visit the new museum.
A．are going
B．are
C．is going
D．will be
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