18. It is thought that one billion people I the world,
_
is half the word’s workers, earn their living by farming.
A. if
B. that
C. which
D. what
选B。句中“half the world’s workers”是对“one billion people in the world” 的补充说明, “that is”是 “that is to say”的省略说法,是插入语,that 并不是引导非限制性定语从句的,如果在 “that is”后加个逗号则更清楚,应选B。
19.Hawking became world-famous in _______.
his thirties in the 1970’s
the thirties in his 1970
his 30s in 1970’s
the thirties during the 1970
选A。in one’s thirties 在某人三十多岁时,in/during the 1970s意思是“在二十世纪七十年代”。
20.---You should have thanked her before you left.
---I meant _______. But when I was leaving I couldn’t find her anywhere.
A. to do
B. to
C. doing
D. doing so
选B。本句中的meant意思是“本来打算”应该使用不定式。当与want, wish, hope, like, hate, try, have, ought, used, need, be able, be going, be glad, mean等连用时, to代替不定式结构以避免重复。
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