Each of the following sentences in this section has a blank space with four words or group of words given. Select whichever word or group of words you consider the most appropriate for the blank space and indicate your response on the Answer Sheet accordingly.
If scientists have discovered how these patterns work, then it stands to reason that they __________ have also found a recipe for rapid change, right? If only it __________ that easy.
- Amust
- Bwill
- Ccould
- Dmight
Explanation
'It stands to reason that they must have also found' — 'must have' expresses logical deduction or near-certainty about the past, which is exactly what 'it stands to reason' introduces. 'Will have' and 'might have' do not carry this deductive force, and 'could have' suggests mere possibility. Hence (A) must is correct.