Question

22. The water tank (a) had been cleaned (c) has cleaned before it was filled. (b) have been cleaned (d) had cleaned​

Answer 1

Answer:

Option b is the right answer because this is present perfect continuous tense

Answer 2

The water tank had been cleaned before it was filled.

• The noun in the above sentence is 'the water tank'.
• As here the phrase before it was filled is used thus we have to write the sentence in the past participle.
• Thus had been cleaned is the perfect word here.
• Thus, the sentence is "The water tank had been cleaned before it was filled."
• The correct option is a.