Wind power is an ancient source of energy we may return in the near future.
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on which
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by which
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to which
D
from which
推荐题目
The expert’s theory, _____ my opinions were based, proved right in the end.
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on which
B
whom
C
for which
D
that
Some fans, _____ money was a big problem, could not afford to go to the concert to see their star play.
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for whose
B
with whose
C
with whom
D
for whom
The days _______ we spent together on the farm are not easy _________.
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when, to forget
B
which, to be forgotten
C
that, to forget
D
/, to be forgotten
People _______ the dead person was related would make paper-cut offerings on special days.
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who
B
for whom
C
to whom
D
whom