问题
选择题
She says that she'll have to close the shop ________ business improves.
A.if
B.unless
C.after
D.when
答案
答案:B
题目分析:考查连词:A. if如果,B. unless除非,如果不,C. after在…后面,D. when当…时候,句意:她说她将不得不关掉商店,如果生意没有改善的话。选B。