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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Neither John (or) his father (was) able (to wake up) early enough to (catch) the morning train.
A．
B．asleep
C．to wake up
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单项选择题
______ to speak when the audience interrupted him.
A．Hardly had he begun
B．No sooner had he begun
C．Not until he began
D．Scarcely did he begin
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