单项选择题

Three weeks after the suicidal bombing, the police were still hunting for bombers for they believe more were ______.

A．on the verge
B．on the sly
C．on the spot
D．on the loose
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单项选择题
I must go now. ______, if you want that book I'll bring it next time.
A．incidentally
B．accidentally
C．occasionally
D．subsequently
单项选择题
These experiments all ______ that a liquid exerts an upward force on any object placed in it.
A．indicate
B．suggest
C．mean
D．imply
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