I recognized him I saw him, though we had been apart for over a decade.A. as soonB. at on

I recognized him I saw him, though we had been apart for over a decade.
A. as soon
B. at once
C. the instant
D. the first time

A. as soonB. at once(答案→)C. the instantD. the first time解析：考查连词。句义：我一看见他我就认出了他，尽管我们已经分开十多年了。 A. as soon 短语不对，应该是：as soon as B. at once立刻，不是连词，不加句子 C. the instant 连词，一…就…D. the first time 连词，第一次，意思不对，所以C正确。

我也是这个答案