问题
选择题
Upon their entering the tomb, Carter’s lucky pet bird, which he ____ in Cairo, was swallowed by a snake.
A．was left
B．had left
C．left
D．was leaving
答案
答案：B
考察时态。根据句意可知，leave in Cairo发生在swallow之前，即过去的过去，所以用过去完成时。
句意为他们已进入坟墓，Carter的幸运宠物，即他留在开罗的那个，就被一条蛇吞掉了。