Question

The Boy Scouts (love, loved) their new clubhouse, which they built last summer.

Short answer

The correct sentence is: 'The Boy Scouts loved their new clubhouse, which they built last summer.'

Step-by-step solution

Identifying the tense

Identify the tense required by looking at the context of the sentence. The reference to a specific past time ('last summer') indicates that this sentence requires a form using the past simple tense.

Choosing the even form

Between 'love' and 'loved', 'love' is the present tense form of the noun, and 'loved' is the past simple form. Since the required tense is past simple, the correct verb form to choose is 'loved'.

Inserting the correct verb form

Insert 'loved' into the sentence in place of '(love, loved)', giving: 'The Boy Scouts loved their new clubhouse, which they built last summer.'