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;

正确答案是：

同类题型

Between the two windows a picture.

Sherlock Holmes________ to Doctor Watson and therefore others couldn’t hear what they weretalking about. [ ]

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Why don’t you hand in your homework— I’m sorry. I _____my homework at home.

The shirt with Michael Jackson’s picture on it must belong to Tom. He admires him.— No， it _________ be his. He dislikes black.