问题

I failed again，but my parents encouraged me and told me that failure________the mother of success.

A:was
B:is
C:be
D:been

正确答案是：

同类题型

______ all the bookshops in our town for the book I needed but I couldn’t get one.

The difficulty lies in ________ they will come to our help immediately.

Are there any oranges in the bag — -Yes. But only .

There is reason to believe that most writers have difficulty in ________ the opening paragraphs oftheir papers.[ ]

There are people in the village.