单项选择题

-- Can you go shopping with us this afternoon-- Sorry, I can't. I ______ take care of my little sister because she is ill.

A． have to
B． may
C． would
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He will have learned English for 3 years ______ the end of this term.
A． at
B． by
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单项选择题
My aunt has two children. But ______ of them lives with her.
A． each
B． either
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