It was 2005 --he finished his study abroad and returned to his motherlandA WHEN b SINCEcTHATd THEN选A为什么 2005前面不加IN!不加难道也可以吗?

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It was 2005 --he finished his study abroad and returned to his motherland
A WHEN
b SINCE
cTHAT
d THEN
选A为什么 2005前面不加IN!
不加难道也可以吗?

选择A
这是个定语从句
如果加上in 就得选that 变成勒一个强调句