A spokesman for the board of directors announced that the chairman will step down ______and when it becomes necessary.

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问题 A spokesman for the board of directors announced that the chairman will step down ______and when it becomes necessary.

选项 A、if
B、there
C、then
D、so

答案A

解析 并列连词and连接并列、对等的语法成分。因此横线处应填入与when对等的从属连词。答案是(A)if.
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