单项选择题
Not until most of the people had left the airport ______ his sister was there.
- A．had he seen
B．did he see
C．that he saw
D．that he had seen
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相关考题
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单项选择题
If the United States had built more homes for poor people in 1955, the housing problem now in some parts of the country ______ so serious.
A．wouldn’t have been
B．will not be
C．wouldn’t be
D．will not have been -
单项选择题
It will be warmer and warmer, ______ more and more trees are turning green.
A．for
B．where
C．before
D．that -
单项选择题
Prisons in the country are short of staff, ______ means prison officers are overworked and underpaid.
A．where
B．who
C．which
D．when
