Question

【题目】 ---Where is Tom? ---I’m not sure. He _________ football on the playground.

A. could playing B. must be playing

C. might be playing D. must playing

Answer 1

【答案】C

【解析】

试题分析：句意：-汤姆在哪里？-我不确定。他可能在操场上踢足球。在情态动词后的动词要用原形。must be一定是；might be可能是。所以选C。