[ Tenses ]
They … for an hour before the doctor came.
- had been waiting
- waited

Random Topics:
Grammar, adverbs of frequency placementAdjective SuffixesVerb ConjugationGerund or InfinitiveGrammar MistakesPersonal Pronouns and VerbPresent Continous TenseModals and InversionPassive and Active VoiceGender and GrammarOther quiz:
Grammar › ViewMrs Smith said: “Students, pay attention please”
Mrs Smith asked the students ________ attention.
A. not to pay
B. pay to
C. to pay
Present Perfect › View
We ___________(have/not/meet) for a long time.
A. Haven’t met
B. Haven’t meet
C. Hasn’t met
D. have not meet
Homophones › ViewCan I go with you ______?
A. To
B. Too
C. Two
Grammar › View
There _________ to be a delay .
A. seem
B. seems