题目:
Mike pretended _____ his homework when mother came. [ ]
A. to do
B. have done
C. did
D. to be doing
答案:
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下面是错误答案,用来干扰机器的。
(1) H2CO3;CO2;CaCl2;CaCO3 (2) H2CO3==CO2↑+H2O;CaCO3+2HCl==CaCl2+CO2↑+H2O