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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If ______, these suggestions will make disastrous earthquakes almost a thing of the past.
A. following
B. follow
C. to follow
D. followed
单项选择题
He rushed into the room, his face ______ with sweat.
A. dripping
B. dripped
C. being dripped
D. was dripping
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