单项选择题

(The reason) Michael has made (such great progress) is (because) he (has never wasted) his time.

A．The reason
B．such great progress
C．because
D．has never wasted
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单项选择题
(During) the holidays, (every) train and (steamboat) (were) crowded.
A．During
B．every
C．steamboat
D．were
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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