[ Grammar ]
They _______________ some action on pollution this year, and the air is already cleaner.
A. had taken
B. have taken
Select your answer:
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ConjunctivesVocabularyGrammar & VocabularyZero and First ConditionalsSimple Past Tense and Past Perfect TensePresent Simple and Modal VerbsMiscellaneous Grammar Usagesso vs suchPossessive Adjective and PronounPast Continuous vs Past SimpleOther quiz:
Modal Verbs of Possibility › ViewThe lights are off in the office. The workers ___ still be there.
A. must
B. might
C. can’t
D. could
Grammar › View
Nam didn’t go to school yesterday ……………. his sickness.
A. because
B. because of