单项选择题

We haven't heard from Jane for a long time. What do you suppose ______ to her

A．to happen
B．has happened
C．is happened
D．happening
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单项选择题
I invited Joe and Linda to dinner, but______ of them came.
A．neither
B．either
C．none
D．both
单项选择题
Physics ______ one of the subjects that I like.
A．is
B．are
C．were
D．was
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