高中 英语单项选择题解析

高中 英语单项选择题解析
21．It is ______ challenge for graduates to find ______ work as unemployment is very high nowadays.A. the; / B. a; / C. a; a D. /; the【答案】 【解析】 24．Please keep ______ secret that he has decided to give up his present position.A. one B. this C. it D. that【答案】 【解析】 26．There is a real danger ______ the U. S will not keep its position on the world economic stage.A. where B. that C. which D. one【答案】 【解析】 27．After a year’s training, they were made entirely used ______ under water.A. to stay B. to staying C. staying D. stay【答案】 【解析】