◎ 题干
He _____ in the classroom just now. he _____ be there now.

[     ]

A. heard to sing, may
B. was heard sing, must
C. heard sing, must
D. was heard to sing, may
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“He _____ in the classroom just now. he _____ be there now. [ ]A. heard to sing, may B. was heard sing, must C. heard sing, must D. was heard to sing, may …”主要考查了你对  【情态动词】【被动语态】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。