Among the 15-year-old children, some______be studying in university while others

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问题 Among the 15-year-old children, some______be studying in university while others are still learning to read and write.

选项 A、should
B、would
C、can
D、must

答案 C

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。

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Doinghomework______mostofthechildren’ssparetime,sotheyhavelittletim