They thought hard ( ) at last the woman had an idea.请问括号里填什么.急用

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They thought hard ( ) at last the woman had an idea.请问括号里填什么.急用

They thought hard ( ) at last the woman had an idea.请问括号里填什么.急用
They thought hard ( ) at last the woman had an idea.请问括号里填什么.急用

They thought hard ( ) at last the woman had an idea.请问括号里填什么.急用
是不是填连词呀 and

before
when