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Direction.

In the following questions, in the given sentences, a part of the sentence is underlined. Beneath each sentence, four different ways of phrasing the underlined part are indicated. Choose the best alternative.

What is the correct answer?

4

His father won't be able to leave for Varanasi until they have arrived .

A. until they arrive

B. until they will arrive

C. until they will have arrived

D. No improvement