题目
He missed two classes, so he had to _ to catch up on his homework.A. stand upB. staying upC. stay upD. standing up
He missed two classes, so he had to _ to catch up on his homework.
A. stand up
B. staying up
C. stay up
D. standing up
题目解答
答案
C. stay up
解析
此题考查动词短语的用法。stand up 意为“站起来”，staying up 意为“熬夜”，stay up 意为“熬夜”，standing up 意为“站起来”。根据句意，他错过了两节课，所以他不得不熬夜来补上他的作业。因此，正确答案是 stay up。