he took plane, he was frightened to cry.A. First timeB. At the first timeC. For the first

he took plane, he was frightened to cry.
A. First time
B. At the first time
C. For the first
D. The first time

A. First timeB. At the first timeC. For the first(答案→)D. The first time解析：句意：他第一次坐飞机吓哭了。因为逗号前后都是句子，所以这里应该用连词。除了一些从属连词引导时间状语从句之外，一些词组也可以引导，这时它们就当连词用，其中表示第一次时用The first time，它引导的是时间状语从句，其它的选项不能当连词用，故选D。

谢谢了