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高中英语选择1道 急等!Most visitors sing high praise for _ the volunte

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高中英语选择1道 急等!Most visitors sing high praise for _ the volunteers have
Most visitors sing high praise for ___ the volunteers have done in the park,which is ___ is often reported by the press.
A.all;that B.what;what C.what;all D.which;what
选哪个?附理由~
高中英语选择1道 急等!Most visitors sing high praise for _ the volunte
答案选b第一空后面介词后面跟what引导的宾语从句.what作从句done的宾语.当然也可以用all ,这种情况下,用all做for的宾语,作后面定语从句的先行词.关系代词that在从句中,作宾语,可以省略.第二空,是一个表语从句.从句缺少主语,只能用what引导.