[ Grammar ]
Jeff _____ about changing his field of study.
A. Has been thought
B. Have been thinking
C. Has been think
D. Has been thinking

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Past Simple Negative & QuestionsPRESENT SIMPLE - CHILDRENNounPast Tense (Regular and Irregular)Adverbs or AdjectivesAcademic VocabularyPresent Simple vs Past SimpleUnless If First ConditionalTime Clauses of FutureComplex SentencesOther quiz:
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We _________ the first people to arrive at work.
A. usually are
B. are usually
C. is usually
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Adam is really good at_____________
A. swimming
B. to swim