19._______ is very important for us students to learn English well.
A. It
B. As
C. What
D. There
【答案】A
【解析】考查it形式主语.本题的it是形式主语,真正的主语是后面的不定式to learn English well。在英语中能做形式主语或者形式宾语的只有it,故A正确。
20.They lived a hard life and were often made _______ for over ten hours a day.
A. work
B. to work
C. to working
D. worked
【答案】B
【解析】考查不定式用法。Make sb do sth让某人做某事;变成被动语态的时候,要加上不定式符号to,构成sb be made to do sth;故B正确。
21._____ of the students who took part in the military training is 450.
A. A number
B. A lot
C. Lots
D. The number
【答案】D
【解析】考查主谓一致。本题的关键词是后面的is.说明主语是单数形式,ABC三项都表示许多,都可以修饰可数复数形式,谓语动词都用复数。本题的is说明主语是单数,the number of。。。的数量,做主语谓语动词用单数,故D正确。句意:参加军训的学生的数量是450.
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