单项选择题

I was just coming out of the sea after a swim () I stepped on a sharp stone and cut my foot.

A．as
B．when
C．than
D．before

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单项选择题
He placed the ladder () the wall and climbed onto the top of the house.

A．on
B．against
C．before
D．in
单项选择题
Proud as the boss is, he will have to () his wrong doings one day.

A．ask for
B．answer for
C．send for
D．pay for
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