[ Present Perfect Tense ]
What have they seen
A. They see a lion
B. they saw sea lions.
C. they have seen sea lions

Random Topics:
as...as, comparatives, superlativesPresent Continuous TenseConjunctive Adverbs and PunctuationPast PerfectModals of DeductionGrammar : can, could and be able toUsed to & would & Past SimpleFuture Continuous TensePRESENT SIMPLE vs PRESENT CONTINUOUS + QUANTGrammar - Present PerfectOther quiz:
Conditional Sentences › ViewIt’s too bad Helen isn’t here. If she_____ here, she_____ what to do.
A. is / will know
B. was / knows
C. were / would know
D. are / would have known
Grammar › View
________ Peter ________ Mary?
A. Does – know
B. Is – knowing
C. Does – knows
D. Do – know