[ Grammar ]
This is the first time I’ve made such a serious mistake.
A. Never will I make a serious mistake.
B. First, I made a very serious mistake.
C. Never before have I made such a serious mistake.
D. The first mistake I made was not a very serious one.

Random Topics:
Auxiliary Verbs & Question TagsHow often - long - much - manyGrammar: SyntaxMixed TensesThere is, There are, Some, AnyAdverbial Clauses of Reason / CauseSubjunctivesComparativesPast Continues TensePrepositions and Preposition PhrasesOther quiz:
Some vs. Any › ViewI don’t want … … coffee, thank you.
a. some
b. any
Coordinating Conjunctions › View
I need to go to the store, _____ I am feeling very lazy.
A. for
B. but
C. and
D. so