【題目】As we know, his father is a very famous scientist in physics. But what you don't know is that he _______ as a farmer for five years.
A.has worked
B.worked
C.had worked
D.works

【答案】B
【解析】句意：眾所周知，他父親是物理方面的著名科學(xué)家，但是你不知道的是他當(dāng)了5年農(nóng)民。此處指的是他父親曾經(jīng)是一個農(nóng)民，應(yīng)該用過去式。故選B。

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