6. On weekend, my grandma usually ____ a glass of wine.
A. subscribes to B. engages in C. hangs on D. indulges in

<subscribe>
subscribe 订阅
subscription 订阅量、订金
</subscribe>

<engage in>
engage in 从事某事、忙于某事
engaging 迷人的、吸引人的
engagement 约会、订婚
tryst 约会
</engage in>

<hang on>
hang on 坚持、紧握着、抓住不放
</hang on>

<indulge in>
indulge in 沉浸于其中、放纵的、享受
dull 钝的、枯燥的、白痴的、傻乎乎的、呆滞的、索然无味
</indulge in>