单项选择题

Mr. Jack regretted (to blame) his secretary (for) the mistake, (for) he later (discovered) it was his own fault.

A．to blame
B．for
C．for
D．discovered
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单项选择题
You will (not be able to) succeed (except) you work (harder) than you (do) now.
A．not be able to
B．except
C．harder
D．do
单项选择题
The book was (so bored) that I (returned it) (to the library) (without finishing) it.
A．so bored
B．returned it
C．to the library
D．without finishing
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