Most environmental problems exist because adequate measures

Most environmental problems exist because adequate measures for preventing them___taken in the past.A.was not B.were not C.were not being D.being not 请说明原因,

宇之鸿 1年前已收到2个回答举报

海怀春芽

共回答了18个问题采纳率：77.8% 举报

B.were not
Most environmental problems(主语） exist（谓语） because（引导原因状语从句） adequate measures（从句的主语） for preventing them （主语的定语）were not taken（被动语态做谓语） in the past

1年前

bettyme 幼苗

共回答了1205个问题举报

B.were not
measures 是复数，故用were
后面后in the past. 故用过去式

1年前

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