Fill in the blank with the most appropriate word.
I ________ to him because I thought I ________ him somewhere.
The context refers to
an action that took place in the past without using an adverb of time. This
indicates simple past tense. The second blank should take a verb which
indicates an action that happened before the event in the context took place.
Thus, past perfect tense form of the verb should be used.
"Had spoken/saw" is incorrect as I had
spoken to him after the action of seeing him somewhere. So, both verbs have
taken incorrect tense form.
"Spoke/saw" in option B is incorrect
as both verbs have taken the simple past form. However, the action of seeing
him had taken place before speaking to him. Thus, the second blank cannot take
the simple past form of the verb.
"Spoke/had seen" is correct as both
verbs have taken the correct form according to the events that occurred.
"Spoke" is the simple past form of verb 'speak' and "had
seen" is the correct form of auxiliary had + V2 as used in past perfect
tense.
"Had spoken/had seen" is incorrect as
both blanks do not need to take the past perfect form.
Thus, option C is the correct answer.