储蓄国债（电子式）（）进行部分提前兑取。
A.不能
B.可以一次
C.可多次
参考答案：C
If you _____ the book, you _____ buy it right now, I think. [ ]
A. needn't; needn't
B. don't need; don't need
C. don't need; needn't
D. don't need; needn't to
单动道岔选用一个（）组合。
A、Q
B、DD
C、SDF
D、SDZ
