The professor observes things carefully, ______.
The professor observes things carefully, ______.
A.so does his students
B.his students do so
C.so do his students
D.so his students do
答案及解析： C
The professor observes things carefully, ______.
A.so does his students
B.his students do so
C.so do his students
D.so his students do
答案及解析： C