单项选择题

This morning the boy was still vivid, but now he suddenly burned ( ) with no warning.

A、up
B、down
C、in
D、off
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单项选择题
I often reflect ( ) the beauty and complexity of life.
A、/
B、with
C、by
D、on
单项选择题
I had to buy _____________ these books because I don’t know which one was the best.
A.both
B.some
C.neither
D.all
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