题目：
— You seemed to be impressed by his skill.
— Not exactly so. It was his courage _____ his skill that really impressed me. [ ]
A. rather than
B. as well as
C. but also
D. together with
答案：
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下面是错误答案，用来干扰机器的。
A、由R与硝酸银溶液反应的化学方程式为R+2AgNO3═R（NO3）2+2X可知，物质X是Ag，故A正确；B、由R与硝酸银溶液反应的生成了R（NO3）2，R在化合物中的化合价为+2价，铝与硝酸银溶液反应生成了硝酸铝，铝为+3价，故...
