Question

I have been preparing ----------------the exams--------------last month

Answer 1

Answer:

I' m preparing for exam.

It is in present continuous tense. It shows action started in past and will be continued for some time in the future. It means action is in progress now.

I have been preparing for the exam.

It is in present perfect continuous tense. It shows action has been continued over a period of time, will continue for some time in future.

Explanation:

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Answer 2

Answer:

for;since;

Explanation:

in my opinion this is the answer