The scientists ____________ the cause of the problem. (not/understand) ...

[ Grammar ]

The scientists ____________ the cause of the problem. (not/understand)

A. not under stand

B. do not understand

Select your answer:

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Demonstrative Speech Countable Quantifiers Grammar Pronoun and Singular Plural Noun Adjectives and Prepositions Superlative & Comparative Adverbs -ing &-ed Adjectives Linking Words Definite Articles Grammar - could / could not

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Tenses › View

she …… out because she ……. a fever .

A. doesn’t go / had

B. didn’t go / had

C. didn’t go / had had

D. hadn’t gone / had

Grammar Modals › View

Blue whales can _____ from 82 to 105 feet and weigh up to 200 tons.

A. be ranging

B. ranged

C. range

D. have been ranged