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19.Professor Mackay told us that ______ of lead are its soft

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19.Professor Mackay told us that ______ of lead are its softness and its resistance.
a.some property c.properties
b.some properties d.property
请高手给个确切的答案,再讲下其中的语法知识,我将感激不尽!
19.Professor Mackay told us that ______ of lead are its soft
选C,整句话意为“MACKAY教授告诉我们铅的特性有柔软度和电阻力”
property做单数时通常指“财产”
做复数时则多指“特性”
只所以不选B是因为表达不对.
通常不会说“它的一些特点有XXXX”,直接说“它特点有xxxx”就行了