单项选择题


A．memory
B．thought
C．knowledge
D．experience
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单项选择题
The children were (surprised) when the teacher (had) them (to) close their books (unexpectedly).
A．surprised
B．had
C．to
D．unexpectedly
单项选择题
The reason he has been such a success ______ he never gives up.
A．is what
B．is that
C．is because
D．is
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