“过” and “了” can be used to indicate ______.

“过” and “了” can be used to indicate ______.
A、tenses
B、aspects
C、tenses and aspects
D、morpheme
【正确答案】：C
【题目解析】：答案选C。“过” and “了” can be used to indicate tenses and aspects.参见教材P97。
掌握“Grammatical morphemes/Subjects and objects”知识点。