单项选择题

______ they invite you to speak, remain silent.

A．Even though
B．Though
C．If
D．Unless
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单项选择题
______ is the question nobody can answer.
A．From where is he
B．Where he is from
C．Where is he from
D．He is from where
单项选择题
When you drive home, you can't be ______ careful.
A．very
B．too
C．so
D．only
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