真题练习

289.The writer of the novel is a professor in his ______.

A.thirtieth
B.thirty
C.thirty's
D.thirties

290.How many pens would you like,Madame?
Well,I want _____ these.

A.three dozen
B.three dozen of
C.three dozens
D.three dozens of

答案解析

289.答案是D；in one's thirties 在某人三十多岁时。

290.答案是B;dozen前有基数词时，其后一般不与of连用；但如果名词前有these,those,the,one's等时，须接of。如:three dozen pens,three dozen of the pens。