B.if
C.because
D.while
答案 B
解析 本题要求填入的是一个连词,用来连接一个表示与过去事实相反的虚拟条件句。本句的意思是:“如果没有科学家早年打下的基础,那些在科学上接受过很少或没有接受过教育的人就不可能有所发明创造”。if如果,通常用在虚拟条件句中。
20.A.ago
B.past
C.ahead
D.before
答案 D
解析 本题要求填入的副词用来修饰一个过去完成时的谓语动词,即表示过去某个时间以前发生的动作,因而只能用before。
Ⅱ.阅读理解
The day was warm and the sun shone down like a new beginning on my life.I was waving goodbye to my son,the last one of my fledglings(刚会飞的鸟) to leave home and go to new woods,“University actually”.I felt so lighthearted after spending many years looking after my four children—cooking,washing,ironing,teaching them how to look after themselves and manage their finances—that I actually thought “At long last,freedom”.
But,as I watched my last one leave,although it was a joyous occasion,I realized I had not really prepared for this day,I was_too_tied_up_with_bringing up these adults of the future to realize that they would all leave the nest and lives independently.
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