题目

 ________ excited Geoff Marcy most was ________ there were planets in other solar system where life might exist. A. It; if            B. That; whether  C. What; whether D. What; that 答案： C。句意为：让Geoff Marcy最兴奋的是在其他的恒星系中是否存在有生命生存的行星。what引导主语从句。

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