[ Grammar ]
He was ill and fell _____ his work.
A. behind
B. behind with
C. behind on
D. behind for

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Vocabulary Spelling GrammarComparison Degree & GerundsRelative Clauses and etcAction VerbPast Tense (Regular and Irregular)Grammar: was/wereInfinitive GerundSubject/Verb Agreement with Collective NounsSimple Present VS Present ContinuousRoot WordOther quiz:
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