Question

用must, might, could, can't填空

The toy ________ be Bob's. He is the only little kid.

Answer 1

答案：must
解析：

点拨：对现在肯定的猜测用must be结构，据后一句“他是惟一的小孩＂可知“这个玩具一定是鲍勃的”。