He used to be fond of chewing bubble gum in class.
注：used to do sth 过去常常/总是做某事
be fond of doing sth 喜欢做某事
他过去总喜欢在课堂上大嚼口香糖 English回答
He used to be fond of chewing bubble gum in class.
注：used to do sth 过去常常/总是做某事
be fond of doing sth 喜欢做某事