单项选择题

What was it ______ caused the forest fire

A. who
B. that
C. this
D. whom
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单项选择题
It was about 150 years ago ______ Dalton put forward the important idea.
A. when
B. that
C. at which
D. \
单项选择题
______ who caused you to serve dinner an hour later than usual
A. Was he
B. Did he
C. Had he
D. Was it he
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