—What is behind the tree? —There must be a dog ______ there. [ ]A. to sit B. sit C. sitting -九年级英语

题目简介

—What is behind the tree? —There must be a dog ______ there. [ ]A. to sit B. sit C. sitting -九年级英语

题目详情

—What is behind the tree?
—There must be a dog ______ there.
[     ]
A. to sit
B. sit
C. sitting
题型:单选题难度:中档来源:专项题

答案

C

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