In order to open the door, the former door _____________ ...

[ Modals and Comparative Superlative ]

In order to open the door, the former door _____________ be kept shut.

A. could

B. must

C. can

D. has to

Select your answer:

Random Topics:
GRAMMAR - Could / Could not Future Tense (will/be going to/p.continuous)Second and Third Conditional Adjectives & Adverbs Clause Present Perfect Simple and Continuous Identifying Sentence Types Possessive Adjective and Pronoun Clauses and Conjunction

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A. Therefore

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