单项选择题

Obviously, the Chairman's remarks at the conference were _________ and not planned.

A．substantial
B．spontaneous
C．simultaneous
D．synthetic
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单项选择题
The scientists have absolute freedom as to what research they think it best to _________.
A．engage
B．devote
C．seek
D．pursue
单项选择题
The newly married couple hasn't decided which hotel _________.
A．to stay
B．to stay at
C．is to stay
D．is for staying
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