He is reading a novel but he ______ a textbook.

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问题 He is reading a novel but he ______ a textbook.

选项 A、ought to read
B、should be reading
C、shouldn’t have read
D、may be reading

答案B

解析 should be reading与前面的He is reading相呼应,意思是:他正在看小说,但这时候他本应该在读课文的。[A]的read改为be reading也对。
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