△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 ( )r
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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 ( )r](/uploads/image/z/7773788-20-8.jpg?t=%E2%96%B3In1850%2Cabout+a+third+of+U.S.A.%28+%29covered+by+forests.A.were+B.has+been+C.%2F+D.was+%E2%96%B3Half+of+the%E2%96%B3In1850%2Cabout+a+third+of+U.S.A.%28+%29covered+by+forests.A.were+B.has+been+C.%2F+D.was%E2%96%B3Half+of+the+class+haven%27t+done+all+of+the+homework+because+some+%28+%29r)
△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 ( )r
△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?
△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 ( )r
△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