[ Vocabulary and Tenses ]
they … for an hour before the doctor came
A. had been waiting
B. waited

Random Topics:
Tenses and ArticleZero Conditional SentencePrefixes SuffixesPast Tense and NeutralGrammar of Future PlansModal Verbs of PermissionUncountable NounsVerb & GrammarTime ClausePassive Voice Present SimpleOther quiz:
Relative & Interrogative Pronouns › ViewThe scientist _______ you showed the bird is here.
A. who
B. whose
C. to whom
D. to who
Perfect Verb Tenses › View
Identify the perfect tense in the following sentence: “She has finished her homework.”
A. Present Perfect
B. Past Perfect
C. Future Perfect
D. Simple Past
Mixed Conditionals › ViewIf I was a good cook,
A. I will invite you to lunch.
B. I would invited you to lunch.
C. I’ll have invited you to lunch.
D. I’d have invited them to lunch.
Grammar › View
My grandfather is very old. So, _____ lives with ______.
A. him …… we
B. he …… us
C. I …… our
D. she …… them
