Scientists photographed for the first time ever _____ wild gorillas used a stick to test the depth of a pool before getting into it, according to a recent study.
A．whichB．whatC．thatD．when
C
考查名詞性從句。以that引導(dǎo)的賓語從句，充當photographed的賓語。科學家近期首次發(fā)現(xiàn)野生大猩猩在進入水池之前先用一根木棒測量水的深度，科學家拍攝到了這些場面。
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