原文：A successful operation

  The mummy of an Egyptian woman who died in 800 B.C. has just had an operation. The mummy is that of Shepenmut who was once a singer in the Temple of Thebes. As there were strange marks on the X-ray plates taken of the mummy, doctors have been trying to find out whether the woman died of a rare disease. The only way to do this was to operate. The operation, which lasted for over four hours, proved to be very difficult because of the hard resin which covered the skin. The doctors removed a section of the mummy and sent it to a laboratory. They also found something which the X-ray plates did not show: a small wax figure of the god Duamutef. This god which has the head of a cow was normally placed inside a mummy. The doctors have not yet decided how the woman died. They feared that the mummy would fall to pieces when they cut it open, but fortunately this has not happened. The mummy successfully survived the operation.

我的疑问1：The mummy of an Egyptian woman who died in 800 B.C. has just had an operation.

这里have是“有”的意思，静态动词，静态动词完成时加持续时间状语必具性。这里却没有。

我的疑问2：The mummy is that of Shepenmut who was once a singer in the Temple of Thebes.

网上说这里that指代mummy，如果这样那为什么不直接the mummy of shepenmut was once….这样不更好？