To my ears, B is the most natural. I think because "is climbing the walls" or "was climbing the walls" is more idiomatic. You don't actually climb the walls (unless you're a chimpanzee, I guess), so the idiom means that you are distraught with worry, and "climbing" just sounds better.
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Grammar Geek
To my ears, B is the most natural.
I think because "is climbing the walls" or "was climbing the walls" is more idiomatic. You don't actually climb the walls (unless you're a chimpanzee, I guess), so the idiom means that you are distraught with worry, and "climbing" just sounds better.
D would work if changed to this: By midnight, Colin
MrPedanticI like your sense of humour.
All sound ok to me except C and F.
(But sometimes my ears play up, at this time of night.)
MrP