问题
选择题
A cat, ______ it is a white one ______ a black one, is considered to be a good cat as long as it can catch mice.
A．both; and
B．not only; but also
C．either; or
D．whether; or
答案
答案：D
题目分析：句意：一只猫不管是白猫还是黑猫，只要抓住了老鼠就是好猫。A……和……都B不仅……而且。C或者，或者D不管，还是，根据句意及结构，故选D。