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  3. "Did you call to make your airline reservation?" "Not yet, but I______

"Did you call to make your airline reservation?" "Not yet, but I______

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问题 "Did you call to make your airline reservation?" "Not yet, but I______
选项 A、should have
B、may
C、must
D、shall
答案A
解析 should have done表示“应该做，而事实上没有做”。
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