Choose the correct verb form : Marine biologists are concerned about the effects of untreated sewage that -- into costal water.

1. Choose the correct verb form : Marine biologists are concerned about the effects of untreated sewage that -- into costal water.

[ঢাবিঃ গ ইউনিট (ব্যবসায় শিক্ষা) ২০১১-২০১২ : 2012]

1. flow

2. flows

3. is flowing

4. flowed

5. flown

Answer

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