题目内容

When people are changing their jobs, homes, partners and lifestyle more often than ______, they need opportunities to learn at every age.(2009.12.CET-4)

A. ago
B. ever
C. previously
D. formerly

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Investigators agreed that passengers on the airliner ____ at the very moment of the crash.(2002.6.CET-4)

A. ought to die
B. must have died
C. must be dying
D. should have died

He left orders that nothing ____ touched until the police arrived here.(1997. TEM-4)

A. should be
B. ought to be
C. must be
D. would be

He hardly ____ say anything more since we know all about it.

A. need
B. needs
C. need to
D. needn’t

John ____ be working in his office now because I saw him only ten minutes ago in the shopping mall.

A. mustn’t
B. isn’t
C. can’t
D. may not