第25题: [单项选择]Among the 15-year-old children, some ______ be studying in university while others are still learning to read and write. A. should B. would C. can D. must 参考答案:C 答案解析:[考点] 情态动词
[解析] 情态动词的进行时表示对现在和将来正在进行的行为进行推测,can be doing意为“也许正在”。根据题意,此题应用情态动词can,故选C。