请选择DCBA4E+P*U,E)m:x－Jim, have you finished reading Harry Potter and Half-Blood Prince ?,d*p4K;`9T*p*g-~.j
－No. I __________ my father on the farm all day yesterday.,d*p4K;`9T*p*g-~.j
A．would help,d*p4K;`9T*p*g-~.j
B．had helped,d*p4K;`9T*p*g-~.j
C．was helping,d*p4K;`9T*p*g-~.j
D．have been helping,d*p4K;`9T*p*g-~.j