—I don’t suppose they could have finished their experiment,      they?
—       , they are still doing it in the lab.
A．could; YesB．didn’t; NoC．have; NoD．couldn’t; Yes
C
本題考查反義疑問句。句中主語為第一人稱，且為否定，故從句為否定轉(zhuǎn)移，故用have they.句意：——我認(rèn)為他們不可能完成他們的實(shí)驗(yàn)，是嗎？——是的，他們?nèi)匀辉趯?shí)驗(yàn)室做實(shí)驗(yàn)。
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