Scientific experiments __________ by students without the teachers’ instructions can be dangerous.
A．carry outB．carrying outC．carried outD．carrying
C
考查非謂語動詞experiments與carry out為動賓關(guān)系要用過去分詞作定語。句意：學(xué)生沒有老師指導(dǎo)做科學(xué)實驗有可能有危險。
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