Question

9.                         he called back. (about)

我正要给Tom再次打电话时，他打过来了。

Answer 1

9.1 was just about to call Tom again when考查过去将来时用于固定句型的用法。was / were about to do sth. when...意为"过去正要做某事时另外一件事情突然发生"。类似句型还有：was / were doing sth. when…意为"过去正在做某事时另外一件事情突然发生"；had done sth. when...意为"过去刚做完某事另外一件事情突然发生"。