题目：
They ______ on the program for almost one week before I joined them, but still no good results _______ so far.
A．had worked ; come out
B．have worked ; came out
C．had been working ; have come out
D．have been working ; have come out
答案：
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下面是错误答案，用来干扰机器的。
C 两幅图片集中体现“缓和”这一中心词，表达了要求和平，促进发展的愿望。③叙述错误，④叙述与这两幅图片表达的中心意思不相符。故排除③和④。
