[ Grammar ]
Scientists now know that the lack of an embryonic thumb in birds is why ____ almost impossible for birds and dinosaurs to be related.
A. is
B. it is
C. is it
D. it
Random Topics:
Toeic VerbVerbs, Tenses, and VocabularyModals, Phrasal Verbs, Gerunds and InfinitivesWill & Be going toModal "Have to"Simple and Compound SentencesComplex SentencesCoordinating Conjunctions and Comparative AdjectivesSecond Type ConditionalAdverb of TimeOther quiz:
Adverbial Clause, Noun Clause › ViewThe virus spread ___ fast that everyone being sick at the same time.
A. so
B. such
C. too
D. enough
Conjunction › View
Everybody likes him because he is nice …………. helpful.
A. and
B. But
C. since
D. or