单项选择题

She thought I was talking about her son, ______, in fact, I was talking about my son.

A．whom
B．which
C．while
D．where
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单项选择题
Mrs. Morrison invited us to the party, but our work ______, we politely refused her invitation.
A．not being finished
B．was not finished
C．not having finished
D．had not been finished
单项选择题
For passengers, ships have the advantage of ______ cheaper than trains or planes.
A．having been
B．to have been
C．being
D．to be
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