The two Chinese scientists have made a wonderful discovery, which marks a major _______ in the basic research in the field.
#13677
A
reform
B
approach
C
boundary
D
breakthrough
推荐题目
The teacher ________ his work.
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A
strict with
B
strict in
C
is strict with
D
is strict in
 weather
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A
warmth
B
method
C
theory
D
breathe