A good idea suddenly came to me___I could buy some flowers for her birthday.A.if B.which C.when D.that

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A good idea suddenly came to me___I could buy some flowers for her birthday.
A.if B.which C.when D.that

D.that 引导同位语从句补充说明idea

A

that ,首先排除if 和when,which常用于定语从句充当主语,而句中缺少成分补充说明idea,所以用that。