The fact ____ he is a model teacher is well-known.
A. what
B. which
C. why
D. that
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They expressed the hope____they would come over to China again.
A. which
B. whom
C. what
D. that
Sometimes we are asked ____ we think the likely result of an accident will be.
A. that
B. what
C. if
D. whether
China is not _____ she used to be.
A. that
B. which
C. like
D. what
That is _____ paper came into use in China.
A. how
B. that
C. what
D. which