问题
It was ______ the president’s speech that the secretary spent the whole morning at home.
A:to prepare
B:preparing
C:prepared
D:be prepared;
B:preparing
C:prepared
D:be prepared;
正确答案是：
同类题型
It is not always easy for the public to see _______use a new invention can be of to human life.
This is such________useful book that I have learned a lot from it.
I would appreciate________,to be frank,if goods could be delivered as soon as possible. [ ]
You____________ this morning if you really wanted to see it yourself.