单项选择题

I've looked for my pen everywhere, but I ______ find it.

A． couldn't
B． can't
C． mustn't
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单项选择题
He was made ______ me with my maths.
A． helped
B． helping
C． to help
单项选择题
She ran across the street because she ______ her brother on the other side.
A． met
B． knew
C． saw
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