If a better material______, the strength of the part would have been increased.

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问题 If a better material______, the strength of the part would have been increased.

选项 A、had been used
B、had been using
C、being used
D、using

答案A

解析 本题测试虚拟语气的用法。本句的意思是:“如果用了更好的材料,这一部分的强度就会增加。”表示对过去的虚拟,从句一般用过去完成时,主句用“would have done...”,本句要用被动语态。因此,A为正确答案。
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