单项选择题

______ when she started complaining.

A．Not until he arrived
B．Hardly had he arrived
C．No sooner had he arrived
D．Scarcely did he arrive
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单项选择题
By the first decade of the 21st century, international commercial air traffic is expected ______beyond today's levels.
A．to have extended
B．to be extending
C．being extended
D．having been extended
单项选择题
Call your doctor for advice if the ______ persist for more than a few days.
A．responses
B．reflections
C．symptoms
D．syndromes
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