题目内容
—It is a pity that the disease is terrible at present.
—Yes. It will be worse ________ we take action to do something for it.
A.if B.unless C.until D.when
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题目内容
—It is a pity that the disease is terrible at present.
—Yes. It will be worse ________ we take action to do something for it.
A.if B.unless C.until D.when