The new machine, if 　　　 properly, will work for at least ten years.
A．used B．useC．using D．being used
A

試題分析：句意：那臺新的機器如果被合理使用的話，它將能夠再用至少10年。這里if后是省略句，完整的是if it is used properly，當(dāng)從句的主語與主句的主語一致，并且從句的謂語動詞有be動詞，這時把從句中的be動詞與主語都省去，這里是把if從句放在了句中，影響了考生的判斷，故選A。
考點：
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