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
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For passengers, ships have the advantage of ______ cheaper than trains or planes.
A．having been
B．to have been
C．being
D．to be -
单项选择题
Some folk songs have been ______ down from one generation to another.
A．sent
B．gone
C．come
D．passed
