单项选择题

At last, we found ourselves in a pleasant park with trees providing shade and（）down to eat our picnic lunch.

A．having sat
B．sitting
C．to sit
D．sat

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单项选择题
（）on an airplane before, the old lady felt very nervous.

A．Never having been
B．Having never been
C．Never to be
D．Never being
单项选择题
He got to the railway station half an hour late,（）made us unhappy.

A．that
B．when
C．which
D．what
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