题目内容

I think humour is a vital form of entertainment, ____ it makes us laugh and laughing keeps us healthy.
A．whenB．afterC．ifD．because
D
考察连词。根据句意可知，此处为原因状语从句，
句意为我认为幽默是一种非常重要的娱乐形式，因为它可以让我们笑，并且笑让我们保持健康。
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