[ Tenses ]
How may times________ them so far?
A. have you seen
B. did you see
C. were you seeing
D. had you seen

Random Topics:
A/AnFOR & SINCESimple Compound and Complex SentencesTag QuestionArticles with SubstancesPresent Perfect TensePronoun Antecedent AgreementVerbsAdverb of Frequency and Past Continuous TenseSentence TransformationOther quiz:
Countable Noun › ViewCOMPUTER
A. COUNTABLE
B. UNCOUNTABLE
C. BOTH
Verb Patterns › View
I tried …………… my eyes open, but I eventually fell asleep.
A. keep
B. to keep
C. keeping