– Shall we go out for lunch?– Don’t disturb me. I the letters all morning and six so far

问题补充：

– Shall we go out for lunch?

– Don’t disturb me. I the letters all morning and six so far.

A. write; wrote

B. wrote; have written

C. was writing; wrote

D. have been writing; have written

答案：

A. write; wrote

B. wrote; have written

C. was writing; wrote

(答案→)D. have been writing; have written

解析：考查时态：句意：--我们出去吃午饭怎样？--别打扰我。我一个早上都在写信，已经写了六个小时了。第一空是强调写信这个动作过去到现在一直在进行，用现在完成进行时，第二空强调结果，so far和现在完成时连用。选D。