[ Grammar ]
By end of this year, Staff Sergeant Liu ____________ in the K9 training unit for thirty years.
A. serves
B. is serving
C. has served
D. will have served

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Grammar - FragmentsA(n), the, no articleRelative Clauses beginning with PrepositionsVerbal and Appositive PhrasesGrammar - help/have/let/makeDirect and Indirect QuestionContrast Linking WordsClausesArticles - rulesCorrelative Conjunction & Complex SentencesOther quiz:
Prepositions › ViewIf you’ve got a problem, then do something ______ it!
A. with
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My mirror … broken. I need a new one.
A. is
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