古代世界上最长的运河是 [ ]
A.巴拿马运河
B.京杭运河
C.隋朝大运河
D.苏伊士运河
答案:B
Tim's mum is worried ______ her son's eyesight as he plays online games too much.[ ]
A. for
B. about
C. with
D. of
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