单项选择题

They ______ all their money, so they have to walk home.

A． spend
B． had spent
C． have spent
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单项选择题
Henry ______ be at home because he phoned me from the farm just now.
A． mustn't
B． isn't able to
C． can't
单项选择题
I really don't know ______ about it.
A． what to do
B． how to do
C． to do what
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