The doorkeeper gave the alarm he saw the smoke.A.whileB.the instantC.suddenlyD.b
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The doorkeeper gave the alarm _______ he saw the smoke.
A.while
B.the instant
C.suddenly
D.before
试题答案
B

The doorkeeper gave the alarm _______ he saw the smoke.
A.while
B.the instant
C.suddenly
D.before
B