【题目】—Did you meet with the famous space hero，Nie Hai Sheng.
—I had come here earlier.
A.If only
B.If not
C.But for
D.For fear

【答案】A
【解析】If only是固定短语，意思是“要是……就好了”;If not 意思是如果不”；But for 意思是“要不是”；For fear意思是“唯恐”