Professor Li always allows his students to voice their opinions in class, ______ sometimes their opinions are not sound.A.so thatB.in caseC.even ifD.as though
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C解析这题考查连词辨析：so that为了，in case以防，even if 既然，as though好像，根据句意：李教授经常让学生说出自己的观点，即使他们的观点不合理。选C。