单项选择题

You ______ that letter to James. However, you didn't.

A．ought to write
B．ought to have written
C．should write
D．should be writing
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单项选择题
No sooner had I told him the truth ______ that I should have remained silent.
A．than I had realized
B．than did I realize
C．when I realized
D．than I realized
单项选择题
Some companies have introduced flexible working time with less emphasis on pressure ______.
A．than more on efficiency
B．but more efficiency
C．but more on efficiency
D．than more efficiency
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