单选题
A team can accomplish much more than the sum of its individual members
and yet frequently groups of people are seen to achieve less than ______ by the
individual member working together.
A. could have been accomplished
B. must have been accomplished
C. should be accomplished
D. would be accomplished
【正确答案】
A
【答案解析】could have been accomplished表示“本来可以”的意思，暗含一种假设条件。其他选项都不符合题句的逻辑意义。B项must have been accomplished表示肯定推测而不是虚拟；c项should be accomplished表示一般意义的“应该”，也没有虚拟含义；D项would be accomplished虽然是虚拟形式，但没有“本来可以”的意思，所以只有A项为正确答案。