Mother keeps telling me not to waste money because money is difficult nowadays.
A. earned
B. earning
C. to earn
D. to be earned
网友回答
A. earned
B. earning
(答案→)C. to earn
D. to be earned
解析：句意：妈妈一直告诉我不要浪费钱，因为现在钱不好挣。这里使用了句型“Sth+be+adj+to do”，这个句型中不定式用主动表示被动，所以选C。