that引导的从句和WH-引导的从句可以做主语,这种情况一般可以用it做形式主语,如: It was said that...和That ... was said是一个意思。 ING分词可以做主语。 这道题Because引导的从句不能做主语,所以AB错误。C的plants和become an invasive不对应,不能说一个复数成为一个单数。E的后面那个become应该是多出来的。如果不多,意思也不对。
if 'being' were a modifier, then it wouldn't make sense in its current location, as you'll soon see:
this sentence has the following form: X does not make... therefore, whatever goes in the 'x' slot has to be, or function as, a noun. this rules out a-b immediately (these are subordinate clauses, which can't function as nouns).
in choices c-d-e, the 'being' is a gerund (the -ing form that functions as a noun, as in the sentence taking overdoses of vitamins isn't good for your health). since gerunds function as nouns, that structure is permissible.