单项选择题

I don't know ______ I can come or not.

A．whether
B．if
C．that
D．what
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单项选择题
He never said that he was good at mathematics, ______
A．was he
B．wasn't he
C．did he
D．didn't he
单项选择题
I will fly to Shanghai to. visit my uncle ______.
A．on afternoon May 14
B．in May 14's afternoon
C．on the afternoon of May 14
D．in the afternoon of May 14
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