28. ______with the developed countries, some African countries are left far behind in terms of people’s living standard.
A. Compare B. To compare C. Compared D. Comparing
解答:选(C)考查分词作状语。分词作状语,可位于句首,也可位于句中,与副词的功能相同,本题中表示时间上的伴随。形式上选用现在分词还是过去分词取决于动词与主语的逻辑关系。
29. Li Lei didn’t meet the famous American professor ______ he was on holiday in America last year.
A. unless B. until C. if D. whether
解答:选(B)。本题考查的是由not…until引导的时间状语从句(也可以相当于介词),表示“直到……才”,从句中常用终止性动词。(注:终止性动词:meet、come,go,die,marry,buy,join,leave,arrived等,他们的完成时不能跟for,since等表示一段时间的状语连用),例如:We didn’t leave until he came back.直到他回来,我们才离开。如果not until位于句首时,需用倒装结构。例如:Not until midnight did she fell asleep.直到半夜她才睡着。本题其它选项unless意为“如果不,除非”;if意为“如果”;whether意为“是否”
30. So ______ after she learned the good news that she could hardly fall asleep that night.
A. excited the mother was B. was the mother excited
C. the mother was excited D. excited was the mother
解答:选(D)当从属连词so…that和such
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