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(tái)新的機(jī)器如果被合理使用的話(huà)，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(yǔ)與主句的主語(yǔ)一致，并且從句的謂語(yǔ)動(dòng)詞有be動(dòng)詞，這時(shí)把從句中的be動(dòng)詞與主語(yǔ)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(diǎn)：
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