Fill in the blank with the most appropriate word:
I hope to see you while I _____ in London.
Answer : A
Important thing to determine the sequence of tenses in a sentence is to know that it is arranged in the order is Past --> Present --> Future, just as it happens in real life. Therefore, it is important to determine the occurrence of each action relative to each other.
Reading the sentence in the question, we understand that the speaker hopes to see the other person WHILE he/she is in London. "While" here signifies during the same time as the speaker's visit to London.
Grammar Rule Required
to know here:
Therefore, present tense ("am") is the most appropriate to fill the blank in the subordinate clause.
Thus, the correct complete sentence is:
I hope to see you while I AM in London.