单项选择题

He went on foot, but he by bus.

A．should go
B．ought have gone
C．could have gone
D．could be gone
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单项选择题
Susan in doing the experiment again though she had failed many times.
A．resisted
B．insisted
C．assisted
D．persisted
单项选择题
, you are leaving tomorrow, we can have dinner together tonight.
A．For
B．Since
C．Before
D．While
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