Those ducks are (swimming) in the river.对括号部分提问

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Those ducks are (swimming) in the river.对括号部分提问
Those ducks are (swimming) in the river.对括号部分提问

Those ducks are (swimming) in the river.对括号部分提问
What are those ducks doing in the river?

What are those ducks doing in the river?

What are those ducks doing in the river ?

read these sentences,chose right verb tense in the blank