单项选择题

I'm at my wits' end. Tell me to do.

A．how
B．what
C．when
D．why
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单项选择题
When we got there, what were left behind __ empty bottles.
A．just
B．only
C．were
D．was
单项选择题
He is too young ______ the old society.
A．to see
B．to have Seen
C．to seeing
D．to having seen
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