问题补充：
I had meant to meet you at the airport this morning, but I was too busy for I a report.
A. wrote
B. have written
C. was writing
D. had written
答案：
A. wrote
B. have written
(答案→)C. was writing
D. had written
解析：考查时态：句意：我本打算今天早上到机场接你，但我太忙，因为我正在写个报告。说明写报告是今天早上正在做的事情，用过去进行时，选C。
