问题

The robot needs _______nce a month. And we will check it for you for free.
A:to check
B:be checked
C:checking
D:check;
B:be checked
C:checking
D:check;
正确答案是:
同类题型
―_____ Jim and Sam your classmates ―No, _____ are in different classes.
The police still haven’t found the lost child, but they’re doing all they.
Could I __________ a dictionary from you, David— Sorry, I __________ it to my cousin yesterday.
比较下列句子中“其”的意义和用法,判断正确的一项是 ( ) ① 鹏之背,不知其几千里也 ② 吾其还也③ 天之苍苍,其正色邪其远而无所至极邪 ④ 越国以鄙远,君知其难也