请选择DCBA/]4T6m;`*l;?,|.r-hThe students ____ their classroom every day.0i3F+t5?/T3z0b'Q'T(]
A. clean0i3F+t5?/T3z0b'Q'T(]
B. is cleaning0i3F+t5?/T3z0b'Q'T(]
C. are cleaning0i3F+t5?/T3z0b'Q'T(]
D. cleans0i3F+t5?/T3z0b'Q'T(]