问题
选择题
You shouldn’t keep a pet _______________ you have enough time to care for it.
A.if
B.unless
C.though
D.when
答案
答案:B
题目分析: 句意:你不应该养宠物,除非你有足够时间照顾它。 if如果,unless除非,though尽管,when当……时。养宠物的先决条件是有足够的时间照顾它,故选B