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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单项选择题
As China is such a populous country, the present concern for most people is still ______.
A. starches
B. substance C; sustenance
D. substitute
单项选择题
When he tried to make a ______ , he found that the hotel was completely filled because of a convention.
A．reservation
B．claim
C．mess
D．revision
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