[ To Infinitive or Bare Infinitive ]
However, he didn’t find anything unusual enough ………. why she could remember so much about her life
A. to explain
B. explaining
C. explains
D. explain

Random Topics:
Quantifiers: too many, too much & enoughGrammar & ReadingObject PronounsVocabulary Spelling GrammarSynonym and AntonymPast PerfectAdverb of MannerVerbs + Gerund or InfinitivePerfect ModalsComplex PrepositionsOther quiz:
Interrogative Pronoun › View____ is this tape recorder?
A. Who’s
B. Whose
Present Perfect Tense › View
_______________The Di Vinci Code? It’s an interesting book.
A. Have you ever read
B. Have you ever reading
C. Has you ever read
D. You ever read
Grammar › ViewThe firefighter rescues people from burning buildings and helps put out fires.
A. True
B. False
Gerund & Participle › View
_____ in almost every Vietnamese family’s meal, rice is the most common food in Vietnam.
A. Found
B. Finding
C. To find
D. Having found