[ Grammar ]
My parents have been married ______ 21 years.
A. For
B. Since

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Modals, Conditionals, and Clauses- Defining, Non-definingModal Auxiliaries and To Be VerbsComparatives ( adj/ adv)English for TourismNouns and QuantifiersComparative and SuperlativesPresent Perfect and Past SimpleQuantifiers with NounsGerund and InfinitiveGrammar & TensesOther quiz:
Grammar › ViewThey __________ a lot of effort into the project.
A. did
B. made
C. put
D. done
Grammar › View
Choose the correct verb from the choices
Both David Livingstone and Henry Morton Stanley (is, are) known as great explorers.
A. is
B. are
Grammar › ViewWhat is the predicate (verb) in the sentence?
The Johnsons painted their house recently.
A. painted
B. Johnsons
C. house
D. recently
Tenses and Verb Forms › View
. More Fill in the Blanks 29. We ______ (travel) for six hours by midnight.
A. will travel
B. will have traveled
C. will be traveling
D. will have been traveling