He could have joined us if he had known.
A. He thought it was canceled.
B. He didn’t want to join us.
C. He was unaware of the opportunity.
D. He was busy that day.

Random Topics:
Modals of Obligation and NecessityPast PerfectAdjectives and comparisonsPast Simple and ContinuousLanguage Features of an Opinion ArticleConjunctionsGrammar MistakesTenses and ComparisonsGrammar TOEFLPrepositional PhrasesOther quiz:
Conjunction › ViewMy father lives in Surabaya. He will come to see me. He asks me to pick him in the airport. Which sentence is suitable to the situation given?
A. I will go to the airport to pick up my father.
B. I will go to the airport so that my father will pick me up.
C. I pick my father up to take him to the airport.
D. My father will pick me up from the airport.
Adverbs › View
They ______________ go out on weekdays.
A. hardly ever
B. carefully
C. joyfully
Future Tenses › ViewTake your umbrella with you. It ____ (rain)
A. will rain
B. rains
C. is raining
D. is going to rain
Grammar › View
Choose the correct sentence.
A. Alex love to swim in the pool.
B. Alex love to swimming in the pool.
C. Alex love to swims in the pool.
D. Alex love swam in the pool.
