问题
tically, a good screwdriver should last a lifetime, but it rarely___________, usually because it is used at one time or another as ___________ some other tool.
A:should, a favor for
B:should, a lack of
C:does, a way of
D:does, a substitute for;
B:should, a lack of
C:does, a way of
D:does, a substitute for;
正确答案是：
