单项选择题

In order for one to achieve the desired results in this experiment, it is necessary that (he) (work) as (lastly) (as) possible.

A. he
B. work
C. lastly
D. as
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Before TV, the common man (seldom never) (had) the opportunity to see and (hear) his leaders express (their) views.
A. seldom never
B. had
C. hear
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The differential attractions of the sun and the moon (have) a direct effect (in) the (rising) and falling (of) the tides.
A. have
B. in
C. rising
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