excited Geoff Marcy most was there were planets in other solar system where life might e

问题补充：

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：

A. It; if

B. That; whether

C. What; whether

(答案→)D. What; that

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