The engine…. smoothly when it suddenly stopped. A. Runs ...

[ Tenses ]

The engine…. smoothly when it suddenly stopped.

A. Runs

B. Running

C. Has run

D. Was running

E. Is running

Select your answer:

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Verbs and Prepositions Verbs + Gerund or Infinitive The Present Progressive Tense Prepositions & Modal Verbs Present Perfect Simple & Present Perfect Continuous Grammar Errors Grammar Pronoun and Singular Plural Noun Modals Tenses Wishes Modal Verbs of Certainty and Possibility

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First Conditional Sentence › View

If she ___________, she will fail in the test.

A. have studied

B. didn’t study

C. doesn’t study

D. will study

Grammar for TOEFL › View

The professor could not understand _____ most of the students failed the exam despite the fact that the material had been thoroughly discussed in class and additional study sessions were provided.

A. why

B. if they were paying attention during the lectures,

C. while he was explaining the difficult parts,

D. because they seemed well-prepared during the review,