单项选择题

(Under) no circumstances (we shall) stop (the) research (we've) begun.

A．Under
B．we shall
C．the
D．we've
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单项选择题
Two days (past) (before) he realized that the task was (beyond his) (capacity).
A．past
B．before
C．beyond his
D．capacity
单项选择题
Education is not an end but a(n) ______ to an end.
A．means
B．solution
C．measure
D．idea
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