△In1850,about a third of U.S.A.( )covered by forests.A.were

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△In1850,about a third of U.S.A.( )covered by forests.A.were B.has been C./ D.was △Half of the
△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
请各位亲回答时,说出理由.
为什么third of U.S.A.看作整体,翻译成什么?

△在1850年,美国有1/3的土地被森林覆盖.选B
△班里一半的学生没完成家庭作业,是因为有些题实在太难了.选A

△In1850,about a third of U.S.A.( )covered by forests.A.were 【英语】关于主谓一致△In1850，about a third of U.S.A.( )covered by fores 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. in about a third of a 有点小问题英语1.About a hird of U.S.A were covered三分之二怎么写?2..The d third time's a 70% of the earth -----covered with water.A.are B.is C.were D 两道英语选择题.1.The（）of the house were covered with yellow.A.roof Parts of Africa are covered by a dark cloud. But this is no a small island has 2/5 of its surface covered by forest and