________ we gave him something to eat, he would save it up for his little sister．

A.Whatever

B.However

C.Whichever

D.Whenever

答案及解析： D

解析：

句意为：“每当我们给他东西吃时，他都会省下来留给妹妹吃。”whenever“每当，无论什么时候”符合文意。所以答案是D项。