The doorkeeper gave the alarm _______ he saw the smoke.A．whileB．the instantC．sud_刷题宝

题干

The doorkeeper gave the alarm _______ he saw the smoke.

A．while	B．the instant
C．suddenly	D．before

上一题下一题 0.85难度单项选择更新时间:2010-06-20 08:49:24

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