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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It was in this room ______ Luxun was born.
A. in which
B. where
C. that
D. in where
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I was about to leave my house ______ he came.
A. while
B. as
C. when
D. since
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