單項選擇題

Don't disturb me. I（）letters all morning and have written ten so far.

A.write
B.have written
C.was writing
D.have been writing

你可能感興趣的試題

單項選擇題

Mr. Smith（）a most important part in the development of our city.

A. took
B.had
C.played
D.made

單項選擇題

Could you tell me where Mr. Lake is? ---（）

A.From England
B.At the office
C.He’s working
D.He’s very busy