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
He doesn't (say) in his letter (that) he's going to (be back) (or not).
A．them
B．that
C．be back
D．or not
单项选择题
(Although) I expected something (different), I was (still) surprised by (which) he said.
A．Although
B．different
C．still
D．which
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