I often hear him ______.Today when I pass(经过)the classroom, I hear him ______again .
A.sing; singing | B.singing; sing |
C.singing; singing | D.sing; sing |
I often hear him ______.Today when I pass(经过)the classroom, I hear him ______again .
A.sing; singing | B.singing; sing |
C.singing; singing | D.sing; sing |