时表
语法进行时表将来
ing. *He’s constantly asking me for money. 典型题例： often hear her _____. Listen , he _____in the next room. sing, to sing B. singing, is sing C. to sing,is sing D. sing, is singing 2， Selecting a
ing. *He’s constantly asking me for money. 典型题例： often hear her _____. Listen , he _____in the next room. sing, to sing B. singing, is sing C. to sing,is sing D. sing, is singing 2， Selecting a