units1-6相关论文
pureradium(L.2)[语言点]what引导的名词性从句在句中作表语。它还可5.Cavepaintingshavebeenfoundwhichareatleast20,000yearsold......
1.as for;as for是固定词组,意思是“就……而言;至于”,其后常接名词,代词,且常位于句首。请看例句:......