It is widely believed among bioengineers _____ it will be possible to create life under laboratory conditions．
A．whichB．whatC．thatD．when
C
四個選項分別表示哪一個、什么、那個和什么時候。根據(jù)題意,生物工程師中普遍認(rèn)為,在實驗室條件下有可能創(chuàng)造生命.從句內(nèi)容對前面整句話進(jìn)行修飾說明,故只能選C,that指代整句話.
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