---Poor Tom! He will have to work all the next month. ---Luckily, _______ the basketball games are held.(5.0分) A. except B. except that C. except when D. except for
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【单选题】在下列三个反应中,过氧化氢(H 2 O 2 )所起的作用是 ①H 2 O 2 +H 2 S===2H 2 O+S↓ ②2H 2 O 2 2H 2 O+O 2 ↑ ③H 2 O 2 +C1 2 ==2HCl+O 2 ↑