【英语】关于主谓一致△In1850，about a third of U.S.A.( )covered by fores

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【英语】关于主谓一致
△In1850，about a third of U.S.A.( )covered by forests.
A.were B.has been C./ D.was
△Half of the class haven't done all of the homework because some ( )really difficult.
A is B are
为什么third of U.S.A.看作整体，翻译成什么？

D.这里的a third of U.S.A应该看作整体,所以用单数
A.这里的some指的是homework,是不可数名词,所以用单数
补充啦..是【a third of U.S.A应该看作整体】哦,翻译成“美国的三分之一”,整句的意思就是“1850年时,美国的三分之一都被森林覆盖”

【英语】关于主谓一致△In1850，about a third of U.S.A.( )covered by fores △In1850,about a third of U.S.A.( )covered by forests.A.were In 1850,about a third of U.S.A___(be) covered by forests. 1.单选In 1850,about a third of U.S.A.______covered by forests. In 1620,about half the U.S.A.was covered by forests. 完形填空Long long ago,a famous city was covered by a thick fores 关于主谓一致的英语题A poet and artist______coming to speak to us about in about a third of a 英语-主谓一致,1>.One third of the students in our class are/is gir 英语主谓一致问题.There are a variety of ways of forming healthy habi 英语里的主谓一致是怎么回事?还有a number of 和 the number of 关于英语主谓一致题