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