The Cambrian _____ an important moment in the history of ...

[ Tenses ]

The Cambrian _____ an important moment in the history of life on earth and a time of radical evolutionary experimentation when many animals first _____ in the fossil record.

A. was / had appeared

B. has been / will appear

C. has been / appears

D. is / appeared

E. was / appeared

Select your answer:
A B C D E

Random Topics:

Present Simple and Continuous Present or Past Tenses Clauses and Conjunction Ed and Ing Endings Past Simple and Continuous FOR & SINCE Adverb Clause Verbs + Gerund or Infinitive IF CLAUSE Have to/Has to

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