Upon their entering the tomb, Carter’s lucky pet bird, which he in Cairo, was swallowed b

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A. was left
(答案→)B. had left
C. left
D. was leaving
解析：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。