[ Tenses ]
Complete the sentence to focus on the duration of the activity before the past event: He was tired because he _____ the entire house by himself.
A. cleaned
B. had cleaned
C. had been cleaning
D. was cleaning

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during, for, whileComperative and SuperlativeUnless If First ConditionalHave toTravel VocabularyGrammar and EssayTo Infinitive or Bare InfinitivePresent, Past and Future TenseAsking and Giving OpinionGoing To Be and WillOther quiz:
Mix-Tenses › ViewLast month, I …. Sunny out for lunch.
A. took
B. take
C. is taking
D. has taken
Mixed General Quiz › View
There ___ more than 50,000 University students in Granada.
a. is
b. will is
c. are
d. was
I always eat breakfast before ________ to school.
A. Going
B. To go
C. Go
D. Goes
Subject Verb Agreement › View
The build-up of gases in the air from burning large tracts of forest ______ to global warming.
A. contributes
B. contribute
