(2013·乌鲁木齐高三第一次诊断性测验)That scientist ________ work is successful has been made a model worker.
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A
which
B
who
C
that
D
whose
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We have reached a point ______ a change is needed. 
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A
when
B
with which
C
why
D
where
The students ________ are expected to pass.
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A
were taught by Professor Deacon
B
whom were taught by Professor Deacon
C
when were taught by Professor Deacon
D
Professor Deacon taught