Do you have any idea why …………………………?
A. have those customers complained
B. those customers are complaining
C. do those customers complain

Random Topics:
Too or EnoughUsed to & would & Past SimplePast Continuous TenseModals TensesPersonal & Possessive PronounsGrammar: Have toPresent Perfect and Simple Past TenseGrammar - some / anyConditionals / Unreal PastNoun and PronounOther quiz:
Future Tenses › ViewIdentify the sentence that is in the future perfect tense.
A. I will be going to the store.
B. I will have gone to the store by 5 PM.
C. I will go to the store.
D. I go to the store.
Tenses › View
…you angry with me ?
A. Are
B. Do
C. Will
D. Did
Past Tense › ViewThey used to ____ spaghetti every Friday.
A. cooked
B. cook
C. didn’t cook
Grammar › View
My brother says “I met Tom at the party last month”
A. My brother says that he had met Tom at the party the previous month.
B. My brother said that he had met Tom at the party the previous month.
C. My brother says that he met Tom at the party the previous month.
D. My brother says that he meets Tom at the party the previous month”
