_ we left the building that I realized how dangerous the situation had been.A. Only thenB.

问题补充：

_ we left the building that I realized how dangerous the situation had been.

A. Only then

B. It was only then

C. Only after

D. It was only after

答案：

A. Only then

B. It was only then

C. Only after

(答案→)D. It was only after

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