单项选择题

Mr. Smith is in good health now for it is quite a long time since he ______.

A．not smoked
B．smoked
C．has smoked
D．began to smoke
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单项选择题
-- Who did you spend last week with-- ______.
A．Palmer's
B．The Palmers'
C．The Palmers
D．The Palmer's
单项选择题
You should try to write ______ even when you're busy. As you know, practice makes perfect.
A．now and then
B．up and down
C．sooner or later
D．here and there
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