单项选择题

We got to work and succeeded, after a good deal of ______, in making our butter.

A．trial and error
B．morning and night
C．bitterness and hard
D．failure and success
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单项选择题
Even if his letter ______ tomorrow, it ______ too late to do anything.
A．will arrive... is
B．should arrive... were
C．arrives... will be
D．arrives... would be
单项选择题
One's university days often appear happier in ______ than they actually were at the time.
A．retention
B．retrospect
C．return
D．reverse
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