A balloon______as long as the weight of the balloon and the air inside is less than the upthrust of the air it displaces.

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问题 A balloon______as long as the weight of the balloon and the air inside is less than the upthrust of the air it displaces.

选项 A、will rise
B、to rise
C、rising
D、has risen

答案A

解析 In this future real conditional sentence, will rise is the correct verb form in the result clause.

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托福（TOEFL）

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