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‘Who is at the door?’ ‘It …………………. be the postman.’

Question 1:

‘Who is at the door?’ ‘It …………………. be the postman.’

A. must

B. could

C. Either could be used here

These questions are from this test. Would you like to take a practice test?

Auxiliary verbs exercise - Test 3 | Exercise follow Topic

20 minutes
10 questions