Scientists still wonder ______ cloning will help or harm us and _____ it is leading us.
A．that; whatB．whether; where
C．if; thatD．whether; how
B
wonder帶兩個賓語從句第一個從句不缺成分需一個起連接作用的詞，第二從句缺少狀語。 科學(xué)家想知道克隆對我們有害還是有助并且它要把我們帶向何方。選B
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