单项选择题

In such desperate strains did he find himself that he was reduced to（） the violin in the streets.

A．play
B．playing
C．be playing
D．having played

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单项选择题

（） at the outset, （） instead of shifting things about may be pheromones released when they reach committee size.（）

A．The stimuli set them off... build collectively
B．The stimuli that set them off... building collectively
C．The stimuli setting them off... they build collectively
D．Being set off by stimuli... their building collectively

单项选择题

In （）, it is now clear that this battle was turning point in the war.

A．retention
B．return
C．retrospect
D．revere