HE COULD NOT HAVE KNOWN WHAT WAS IN THE LETTER... HE HAD WRITTEN I...
31. He could not have known what was in the letter... he had written it himself.
A. until
B. if
@C. unless D. if only
31. He could not have known what was in the letter... he had written it himself.
A. until
B. if
@C. unless D. if only