问题
选择题
Many people say they love birds, but some plant trees _________ some make cages.
A.until
B.though
C.unless
D.while
答案
答案:D
考查连词:A. until直到,B. though虽然,C. unless除非,D. while然而,句意是:很多人说喜欢鸟,但一些人种树,一些人做鸟笼。选D。