4 percent of the students at the school who study French（在学法语的里面有4%学日语的） also study Japanese
16 students at the school study both French and Japanese.（都学的有16人）
500 is the multiple of 100 that is closest to x =500是（接近x的）一百的倍数-------450-550
400 is the multiple of 100 that is closest to y=400是（接近y的）一百的倍数------350-450
If you see an answer choice with a plural possessive, do not immediately eliminate the answer choice.
Instead:
Check the answer choice for other errors.
Look for an alternate answer choice that avoids the plural possessive and is free of errors.
If you are stuck between an answer choice that contains a plural possessive and one that avoids this usage, choose the answer choice without the plural possessive.
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C错哪了？
C选项错在，several improvements in blowing machinery前面的介词是不能省略的。因为，With charcoal's being replaced by coal as the fuel used in the smelting of iron ore中的with是独立主格的with，不是一个普通的介词，而several improvements in blowing machinery是一个纯名词，身前需要一个真正的介词。
C可不可以认为charcoal‘s being replaced是一个动名词，这样的话这个结构没有表示动作的非谓语动词，无法构成独立主格
毕老师，请问这个with不可以统领charcoal's being replaced... 和 several improvements...两个部分么？
这样一个with引导了并列的2个成分，成为了主句的原因状语。
在形式上，也符合就近修饰。