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【題目】The teacher told us to remain silent unless _______.
A.to be asked
B.asked
C.being asked
D.you asked

【答案】B
【解析】考查非謂語(yǔ)動(dòng)詞和省略。句意：老師告訴我們要處于沉默狀態(tài)，除非被問(wèn)。故選B。

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