问题

To live on Mars, you need to wear boots which ________ to prevent you from floating off into space.

A:design
B:designed
C:are designing
D:are designed;

正确答案是：

同类题型

hard to believe that Jack ________ have foughtwith the policeman.— Yes. If one ________ ask for trouble, it can’t behelped.

The number of the peoplewhocarsincreasing.

I don’t remember the book yesterday.

The sentence wants _______ once more as many students still have difficulty understanding it.

I heard that a great fire _________ when I was out in Tianjin last night.