Questions 147-149 refer to the following letter.
Dear Sirs,
We were very surprised to learn from your call today that one of the books you ordered was damaged. We calked our warehouse manager this afternoon and he confirmed that a new replacement will be delivered to you by DHL by tomorrow (147) the latest.
We truly regret the damaged delivery and the inconvenience it (148) you.
We have (149) taken the matter up with DHL and are sure that this will not happen again not only to you, but also to all our cherished readers.
Meanwhile, may we suggest that you trust us again and do business with us continuously.

A. yet
B. still
C. already
D. too

Unigraphics（简称UG）是一个（）的CAD/CAM/CAE系统。

A、相嵌式

B、交互式

C、相互式

D、交叉式