单项选择题

The comments which he made ______ marketing bothered his boss greatly.

A．being concerned
B．concerned
C．be concerned
D．concerning
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Was it in 1969 ______ the American astronaut succeeded ______ landing on the moon
A．when; on
B．that; on
C．which; in
D．that; in
单项选择题
They had a pleasant chat ______ a cup of coffee.
A．for
B．with
C．during
D．over
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