【題目】The governments are very cautious about setting a new policy and make no decision _____ they are quite sure it is the right one．

A．because B．when C．until D．as

【答案】C

【解析】

試題分析： 句意：政府對確定一個新政策很小心謹慎，直到確定是正確的才能做決定。使用not…until句型，所以選C。

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