It has been suggested that girls avoid mathematics course for social reasons.为什么用has been suggested 什么结构?

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Ithasbeensuggestedthatgirlsavoidmathematicscourseforsocialreasons.为什么用hasbeensuggested什么结构?Ithasbeen

It has been suggested that girls avoid mathematics course for social reasons.为什么用has been suggested 什么结构?
It has been suggested that girls avoid mathematics course for social reasons.
为什么用has been suggested 什么结构?

It has been suggested that girls avoid mathematics course for social reasons.为什么用has been suggested 什么结构?
1.It是形式主语,代替that从句.
2.It has been suggested that...被动结构,意思是:人们建议...(从句的内容被建议);也可以是:已经表明了.
3.suggest作建议讲时,后面的从句中的动词用虚拟语气,即should+动原形结构,should可以省略.
4.suggest作表明、暗示讲时,后面的从句中用陈述语气.