Help disabled people whenever you can ______ you will make the world a nicer place to live in.

A．unlessB．orC．a(chǎn)ndD．but

C

解析試題分析：句意：不論何時(shí)，只要你可以，就去幫助別人吧。你將使這個(gè)世界變得更美麗。Unless除非； or或者； and 并且； but轉(zhuǎn)折。這里表示遞進(jìn)關(guān)系。故選C。
考點(diǎn)：考查的用法。
點(diǎn)評(píng)：本題難度適中。
即學(xué)即練：I dialed the right number, ______ nobody answered.
A.unless        B.or        C.and          D.but
解析：D。句意：我撥的號(hào)是對(duì)的，但沒有人接電話。

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