Three million tons of coal ___ exploited every year.A is B are

Three million tons of coal ___ exploited every year.A is B are
Three million tons of coal ___ exploited every year.A is B are

Three million tons of coal ___ exploited every year.A is B are
Three million tons of coal __are_ exploited every year. 每年大约有3百万吨煤炭被开采.
我要说从句子主干分析是错误的哦,先说错误的方法.
从句子主干,three million tons of 修饰coal ,因此主语主干是coal
every year 是补足语 因此 句子主干是 coal is exploited 答案是A.
如果你这么想你就大错特错了.
正规的方法应是理解它的意思,并知道考察的是什么知识点.
要明白coal是不可数名词,同样的词还有water,milk,advice,wine等等
但如果用可数量词来修饰如 two bottles of water(2瓶水）,five cups of milk（5杯奶）,3 pieces of advice（3条建议）,则就变成可数了.因此答案是B are
课本常见例句：There are two bottles of water at the store.
再补充一个,上一例句中的提问句为：How much water is there at the store?
考试中常遇到.

A 作为整体

A

借用别人的回答：
coal煤炭是不可数名词，所以用单数形式is.前面的tons是修饰煤炭的。
例：There million litres of gas is used for this company

A