问题

It’s necessary _ us _ more trees in spring every year.

A:when the train leaves
B:when does the train leave
C:when the train left
D:when did the train leave;

正确答案是：

同类题型

It’s reported that some wild animals werefound in a big cave in the mountain.

He is a stranger to me though we have met twice before[ ]

Many scientists have believed that theremay be a _________of life on the Mar

This book on idioms is interesting. I’d like_______. Where did you buy it, Simon— In the Amazon Bookstore.

The fashion show came to ______ end at 5:00 pm, and itwas ________ great success.