1．(2012·湖南，30)It was not until I came here ________ I realized this place was famous for not only its beauty but also its weather.
A．who B．that
C．where D．before
答案：B 句意：我直到来到这儿才意识到此处出名的不仅是它的美而且还有这里的天气。判断强调句式的方法是将it is/was...that去掉时句式是否完整。不难看出此处是强调not until引导的时间状语。故B项正确。
2．(2012·重庆，32)It was 80 years before Christopher Columbus crossed the Atlantic ________ Zheng He had sailed to East Africa.
A．when B．that
C．after D．since
答案：B 强调的是时间状语，故用that来引导。句意：是在克里斯托弗·哥伦布横渡大西洋80年前，郑和就已经航海到了非洲东部。故选B项。
3．(2012·江西，32)Never before ________ seen anybody who can play tennis as well as Robert.
