单项选择题

He set out ______ the theory in simple words.

A．explain
B．to explain
C．explaining
D．explained
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单项选择题
It is important that he ______ tomorrow.
A．should come
B．shall come
C．will come
D．came
单项选择题
It was in this room ______ Luxun was born.
A．in which
B．where
C．that
D．in where
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