单项选择题

Julia must ______ now, because the light of her room is turned off.

A．sleep
B．sleeping
C．be sleeping
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单项选择题
My aunt will arrive here tomorrow. ______ is 50 years old.
A．He
B．She
C．It
单项选择题
Mary spent ______ to buy the TV.
A．two thousand and fifty
B．two thousands and fifty
C．two thousand fifty
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