( ) the door slowly opened, there was a hysterical scream of terror.A:When B:While C:As D:Whenever

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()thedoorslowlyopened,therewasahystericalscreamofterror.A:WhenB:WhileC:AsD:Whenever()thedoorslowlyop

( ) the door slowly opened, there was a hysterical scream of terror.A:When B:While C:As D:Whenever
( ) the door slowly opened, there was a hysterical scream of terror.
A:When
B:While
C:As
D:Whenever

( ) the door slowly opened, there was a hysterical scream of terror.A:When B:While C:As D:Whenever
A
表示当
while必须有一个是进行时态
as一般不放在句首
whenever无论何时,让步状语从句,不对