问题
选择题
Professor Li always allows his students to voice their opinions in class, ______ sometimes their opinions are not sound.
A．so that
B．in case
C．even if
D．as though
答案
答案：C
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。