情态动词表推测

Mr. Bush is on time for everything. How_____ it be that he was late for the opening ceremony? A. can B. should C. may D. need

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Must > Can/ May> Might

“3M 无疑问，must 只肯定”原则

You might just as well tell the manufacturer that many customers____ not like the design of the furniture. A. must B. shall C. may D. need

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