题目内容
Mr.Green is said ________ an experiment to prove the new method of solving the problem when young.
[ ]
A.to do
B.to have done
C.to be doing
D.to have been doing
答案:B
解析:
解析:
|
be said to do据说……A项表示一般动作;B项表示完成的动作;C项表示进行的动作;D项表示完成进行的动作。由when young可知此处应该用不定式的完成式。 |
练习册系列答案
相关题目