-----I wonder if you could go with me to the supermarket.

------- Don’t disturb me. I _____________my experiment report all the morning and haven’t finished yet.

A．write

B．was writing

C．have written

D．have been writting

作家语言的格调（）

A.必然流露本相

B.可以不流露本相

C.以上两者都正确

D.以上两者都不正确