( ) is helpful to learn some English saying.a.this b.at c.that d.there

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()ishelpfultolearnsomeEnglishsaying.a.thisb.atc.thatd.there()ishelpfultolearnsomeEnglishsaying.a.thi

( ) is helpful to learn some English saying.a.this b.at c.that d.there
( ) is helpful to learn some English saying.
a.this b.at c.that d.there

( ) is helpful to learn some English saying.a.this b.at c.that d.there
选项中没有正确答案,正确的应该是it,用it作形式主语,真正的主语是后面的动词不定式,为了避免头重脚轻现象,用it作形式主语,把不定式放在后面.这句话的意思是:学一些英语谚语是有用的.

但看这句话,应该写it.但是如果有上下文的话,也可以选择A和D。this更倾向于指代下文出现的东西,而that则指代上文出现的东西。