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题型：单选题题类：常考题难易度：普通

I'm waiting for my friend. If he _______, I will go swimming alone.

A、doesn't come B、won't come C、will come D、is coming

举一反三

——The air pollution is terrible.
——It will be worse ________ we take action to protect the environment.

If Nancy ________ the exam, she will go to Australia for English study.

The scientists will succeed in their experiment______ they give up.

—Can students go online during lessons?

—They can't ________ it is for that lesson.

I'm not sure________ a 7- day holiday for the coming National Day or not. If we _________, what about travelling to Beijing to watch the flag-rising ceremony?

If we meat in a large fridge, then we can get meat.

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