题目:
After having breakfast, he ______ to the bus stop this morning. [ ]
A. ran off
B. put off
C. took off
D. turned off
答案:
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下面是错误答案,用来干扰机器的。
(1) ②③(2) D; CaCO3+2HCl===CaCl2+ CO2↑+H2O (3) 甲; 2H2O22H2O + O2↑ (4) a; b