Foundation
English
Verb
Tenses
Sentences
Question
shoes and buttons ___5___ be polished daily.
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Solution
Option A is the correct answer because 'have to' is used to express a strong obligation, when we use 'have to' this usually means that some external circumstance makes the obligation necessary.
option D is incorrect because we use 'could' to indicate that something is possibly true, or that it may possibly happen, but in this case, it is a necessity.
Option B and C are incorrect because 'will' and 'shall' are used in a future tense with no defined time limit, whereas the rule clearly states that this rule must be followed with effect immediately.