单项选择题

______many times, he still doesn't know how to use the computer.

A．He has been told
B．We have told him
C．Having been told
D．Having told him
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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
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
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