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问题: 2007浙江杭州七校联考英语12

What's really needed,according to most researchers in this field, _______ a "killer" application particularly suited for the way DNA computing solves problems. A.being B.are C.is D.was

解答:

答案选C。

分析句子成分:
What's really needed是主语从句,according to most researchers in this field可视作插入语,而a "killer" application是表语,particularly suited for the way DNA computing solves problems是修饰表语的定语。

可见,句子缺少谓语,根据时态要求,用is。