【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，

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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，

【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，
【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？

【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，
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”

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