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题型：单选题题类：真题难易度：容易

Tom failed in the exam again ____ he tried his best.

A、if B、unless C、though D、because

举一反三

_______we keep our hearts open, we can experience the happiness friendship brings us.

You should keep working hard ________ you have passed the exam.

—Is the cola yours　　　Ann's?

—It's Ann's.

I was late for school yesterday____the heavy rain.

You should set off early ___________ you can arrive there on time.

The river will become dirtier and dirtier ____________ we take action to protect it.

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