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:
Grammar › ViewNot always do buildings make the neighborhood more beautiful. _______________, there are examples of new buildings which have spoilt the area they are in.
A. Admittedly
B. Because
C. Since
D. However
Grammar › View
Which is the correct version of the following sentence:
My Family traveled to yellowstone national park in march.
_
A. My Family traveled to Yellowstone National park in March.
B. My family traveled to Yellowstone national park in march.
C. My family traveled to Yellowstone National Park in March.
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
