Proper noun it is naming some thing by name if that makes system
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Is this multiple-choice??
A) I used to think
B) I will think
C) I was thought
D) I had thought
E) I have been thought
F) I will be thought
G) i will have thought
H) I have thought
I) I was thought
J) I will have been thought
K) I had been thought
L)I think
:)) hope it helps