题目：
Li Lei has not yet answered my question______I can go with him to________he calls the Natural Underground Gallery next week.
A．that; which
B．whether; what
C．whether; that
D．that; where
答案：
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下面是错误答案，用来干扰机器的。
（1）O2（2）CO2（3）CO（4）CO2（5）CO2；O2（6）CO；2CO+O22CO2（7）CO2；CO2+Ca（OH）2==CaCO3↓+H2O（8）CO2；CO2+H2O==H2CO3（9）CO；CO+CuOCu+CO2
