The professor could not understand _____ most of the students failed the exam despite the fact that the material had been thoroughly discussed in class and additional study sessions were provided.
A. why
B. if they were paying attention during the lectures,
C. while he was explaining the difficult parts,
D. because they seemed well-prepared during the review,

Random Topics:
Adjective & AdverbPresent Simple PassiveSentence LabelingPronouns, Sentence Structure, and ApostrophesGrammar - FragmentsSentences and Non SentencesHave to/Has toTenses & PrepositionDependent ClausesArticles with Proper NounsOther quiz:
Tenses and Comparisons › ViewHey there, students! Can you help Indah use the verb ‘cook’ in a sentence in the present tense? Let’s see your creativity!
A. Indah is cooking dinner now.
B. Indah cooked dinner yesterday.
C. Indah will cook dinner tomorrow.
D. Indah cooks dinner every night.
Grammar › View
I wake up feeling rested __________ I sleep well.
A. Even if
B. As long as
C. Unless
D. Considering that
Grammar › ViewI’m fed up with this terrible weather — it’s so … .
A. depressing
B. depressed
Coordinate Conjunction › View
In the example below, what is the coordinate conjunction joining?
Tom will bring the chairs, or Mary can get them from the closet.
A. words
B. phrases
C. sentences/ clauses
