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It was a long time he realized his responsibility.A.beforeB.sinceC.whenD.after

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It was a long time he realized his responsibility.A.beforeB.sinceC.whenD.after

It was a long time ________ he realized his responsibility.

A.before

B.since

C.when

D.after

试题答案

A

“It was/will be+一段时间+before…”是固定句型。