they began to climb the mountain after they had bought all the food and drink 改成否定句)

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theybegantoclimbthemountainaftertheyhadboughtallthefoodanddrink改成否定句)theybegantoclimbthemountainafte

they began to climb the mountain after they had bought all the food and drink 改成否定句)
they began to climb the mountain after they had bought all the food and drink 改成否定句)

they began to climb the mountain after they had bought all the food and drink 改成否定句)
they didn't begin to climb the mountain after they had bought all the food and drink .

They didnt begin to climb the mountain until they had bought all the food and drink 。

They didn't begin (start) to climb the mountain till (untill) they had bought all the food and drink

B.to