The car driver in front stopped so suddenly. Therefore, the accident happened.
A. If the car driver in front hadn’t stopped so suddenly, the accident can have happened.
B. If the car driver in front hadn’t stopped so suddenly, the accident can’t have happened
C. If the car driver in front hadn’t stopped so suddenly, the accident could have happened.
D. If the car driver in front hadn’t stopped so suddenly, the accident couldn’t have happened.

Random Topics:
Comparative and Superlative AdjectivesPast form of ModalsPast Simple or Past ContinuousFuture Tense (will/be going to/p.continuous)TOEFLGrammar and Passive VoiceCOUNT - NONCOUNT NOUNSSentence Types and ConjunctionsEs and SSimple and Past TensesOther quiz:
Grammar: Syntax › ViewAuxiliary verbs which denote possibility, necessity or obligation. The main ______ verbs are: can, could, shall, should, will, would, may, might, must, ought.
A. modification
B. deixis
C. imperative
D. modals
Adjective › View

a.sleepy
b.sick
c.hungry
d.full
He is devoted to _________ at the local orphanage, helping to improve the lives of disadvantaged children.
A. volunteer
B. volunteering
C. to volunteer
Grammar › View
Mary _______________ to John on the phone every day.
A. talked
B. is talking
C. talks
