【題目】-- When did the Smiths come to China? -- Three years ________.

A. later B. ago C. before D. too

【答案】B

【解析】句意：-Smith一家什么時候來的中國？-三年前。later…之后，放在一段時間的后面；ago…之前，放在一段時間后面，常和過去時態(tài)搭配使用；before在…之前，放在名詞前面；too太；也。根據(jù)句中When did the Smiths come to China可知，這里問的是一件過去的事情，故應(yīng)選B。

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