单项选择题

She is flying to Shanghai ______ an important academic conference.

A．at
B．in
C．to
D．for
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单项选择题
______ from the top of the hill, the lake is just like a mirror.
A．Seeing
B．Having seen
C．To see
D．Seen
单项选择题
My children are looking forward to ______ a trip to Beijing next week.
A．make
B．be making
C．making
D．have made
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