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
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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
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