单项选择题

We ______our breakfast when an old man came to the door.

A．just have had
B．have just had
C．just had
D．had just had
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单项选择题
I don’’t mind ______ the decision as long as it is not too late.
A．you to delay making
B．your delaying making
C．your delaying to make
D．you delay to make
单项选择题
The scientists have absolute freedom as to what research they think it best to_______.
A．engage
B．devote
C．seek
D．pursue
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