VI. Choose the underlined part that needs correcting in each sentence below.
3. I [finish (A)] my work already. [I’m (B)] ready [to go (C)] for a walk [with (D)] you.
4. Acid rain [contains (A)] [harm (B)] chemicals [from (C)] factory gases which (D) damages trees, crops and buildings
5. The patient [does not (A)] [recover (B)] [unless (C)] he has [an (D)] operation.
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