I think humour is a vital form of entertainment, ____ it makes us laugh and laughing keeps us healthy.
A．whenB．a(chǎn)fterC．ifD．because
D
考察連詞。根據(jù)句意可知，此處為原因狀語從句，
句意為我認(rèn)為幽默是一種非常重要的娛樂形式，因為它可以讓我們笑，并且笑讓我們保持健康。
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