My dad (see) the helicopter as he (swim) back to the shore.
A) saw, were swimming
B) saw, was swimming
C) see, is swimming
D) saw, swam

Correct answer: B) saw, was swimming.

The sentence needs Past Simple for one completed action and Past Continuous for the action that was happening at that moment:

My dad saw the helicopter as he was swimming back to the shore.

Saw is the short completed action. Was swimming is the longer action in progress.

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