单项选择题

At last Iris left her house and got to the railway station, only ______ the train pulling out of the station.

A．saw
B．having seen
C．to see
D．to have seen
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John's score on the test is the highest in the class; he ______ last night.
A．must study
B．should have studied
C．must have studied
D．is sure to study
单项选择题
It was dark in the cave so she ______ a match.
A．struck
B．hit
C．fired
D．burned
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