_______he was laid off last year ______ how serious the economic crisis was.
A．Not until…h(huán)e realized B． It was not until… when he realized
C．It is not until…that did he realizeD．It was not until …that he realized
B
考查強(qiáng)調(diào)句：It’s /was not until…that…,直到…才…,句意：直到他去年下崗，他才意識(shí)到經(jīng)濟(jì)危機(jī)是多么嚴(yán)重。選B。
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