问题
Listen! Who _______ in the next room—Sandy. She often _______ there. Her parents want her to be a singer (歌唱家).
A:sings; is sing
B:is singing; sings
C:is singing; sing
D:are singing; sings;
B:is singing; sings
C:is singing; sing
D:are singing; sings;
正确答案是：
