Choose the most suitable option to replace the highlighted part of the sentence:
The researchers have gone through extensive training before starting the fieldwork.
Show answer & explanation
Correct answer: C
Explanation
Correct Answer: had gone through
Explanation:
• When two actions take place in the past, the action that happened earlier is expressed in the past perfect tense (had + third form of the verb), while the later action is in the past tense or takes a time reference indicating the subsequent event.
• Here, the training was completed before they began the fieldwork, so the earlier completed action requires had gone through rather than the present perfect have gone through.
Example: She had finished her homework before heading out to play.