单项选择题

It is strange that she ______ to see her own shortcomings.

A. should have failed

B. has failed
C. fails



D. failed
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单项选择题
______ at the outset, ______ instead of shifting thing 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
______ you are leaving tomorrow, we can eat dinner together tonight.
A. Since
B. While

C. For

D. Before
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