[ Coordinate Conjunction ]
That is a very useful rule, _____ it is difficult to remember.
A. So
B. But
C. Or

Random Topics:
Grammar Like & Linking VerbAdjective ending with ED & INGPronouns and QuantifiersPrepositionSimple Present TenseWill and Going toGerund NounIdiom and TensesAdjectives, ING - EDSecond and Third ConditionalOther quiz:
Modal › ViewI …………….. run, but I …………… swim.
A. can , can
B. should , can’t
C. can , can’t
D. could , could
Conjunctions › View
Identify the conjunction: We can either watch a movie or play board games tonight.
A. both…and
B. either…or
C. not only…but also
D. neither…nor