问题
选择题
As a leading scientist in maths,he once dived ________ it and contributed to his motherland. [ ]
A. into
B. to
C. on
D. at
答案
答案：A
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As a leading scientist in maths,he once dived ________ it and contributed to his motherland. [ ]
A. into
B. to
C. on
D. at
答案：A