[ Grammar ]
The United States has launched many astronauts into space since 1969
A. Simple Present Tense
B. Present Progressive
C. Simple Past
D. Present Perfect

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Sentence Adverbs & Third ConditionalPresent Perfect ContinuousDeterminers & QuantifiersEmployment VocabularyConstrative ConjunctionUsed toPrepositionSubordinating and Coordinating ConjunctionsConditionals Type IPast Tense (Regular and Irregular)Other quiz:
Tenses › ViewWhich tense is used to describe an action that has been completed recently or affects the present?
A. Past Perfect
B. Present Perfect
C. Future Perfect
D. Present Simple
Grammar › View
Mark______ 19, but Brian and Denis ______ 26 and 28.
A. is / are
B. are / is
C. are / are
D. am / are
Grammar › ViewAre these sneakers _____?
A. Its
B. Mine
C. Yours
Verb Tenses › View
It happens once in a blue moon. What does that mean?
A. It only happens when there is a full moon.
B. It only happens at night.
C. It only happens once in a while.
D. It never happens.