【題目】All living flowers ultimately derive from a single ancestorlived about 140 million years ago, a study suggests.
A.why
B.what
C.where
D.that

【答案】D
【解析】考查定語從句。句意：一項研究表明，地球上現(xiàn)存的所有花卉都起源于1.4億年前的同一個“祖先”。 空格前ancestor是先行詞在定語從句中做主語。故選D。

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