Tim’s mum is worried _______ her son’s eyesight as he plays online games too much.
A．forB．a(chǎn)boutC．withD．of
B
考查介詞用法。短語(yǔ)：be worried about 擔(dān)心…，句意：提姆的母親很擔(dān)憂(yōu)她兒子的眼睛因?yàn)樗W(wǎng)上玩游戲玩得太多。所以選B。
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