单项选择题

______ in the queue for half an hour, Tom suddenly realized that he had left his wallet at home.

A．To wait
B．Waiting
C．Having waited
D．To have waited
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单项选择题
My advisor encouraged ______ a summer course to improve my writing skills.
A．for me taking
B．me taking
C．for me to take
D．me to take
单项选择题
I invited Tom and Ann to dinner, but ______ of them came.
A．neither
B．both
C．either
D．None
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