93. The diligent student refused the help of others and insisted on working out the difficult maths problem _____.
A.on his own | B.in his own | C.of his own | D.for his own |
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93. The diligent student refused the help of others and insisted on working out the difficult maths problem _____.
A.on his own | B.in his own | C.of his own | D.for his own |