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
Sara was much kinder to her youngest son than to the others, ______, of course, made the others envy him.
A．who
B．that
C．what
D．which
单项选择题
He devoted all his life to______for human rights.
A．fight
B．fighting
C．fought
D．be fought
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