问答题

Scientists think laser (be)______one of the most useful tools today.

【参考答案】

正确答案：to be
<上一题 目录 下一题>
热门 试题

问答题
He is now accustomed to (walk)______to work everyday.
问答题
At the bus stop (be)______a soldier and two young people on their way to north Carolina.
相关试题