问题

The robot needs ____________once a month. And we will check it for you for free.

A:to check
B:be checked
C:checking
D:check;

正确答案是：

同类题型

Dick made it ______ to all hisfriends

I am really sorry if my comments on the matter ____ you

I want to buy the jacket,_______ I have not enough money with me.[ ]

The film The Flowers of War, which ______ last December, is about saving a group of Chinese students in the 1930s.

My father bought a new bike for me yesterday. It’s a structure of__________.