Question

His bike is broken, so he ________ walk to school． [　　] A． have to B． has to C． must D． may

Answer 1

答案：B
解析：

因为自行车坏了，所以他“不得不”(has to)，而不是“必须”(must)或“可以”(may)走着去上学；主语是第三人称单数，故选B。