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本身有一定的词义，不能独立做谓语，须与表语一起构成复合谓语。连系动词可以细分为①表示“是”的be动词，根据主语有各种形式；
②表示“感觉”的连系动词。如：look, feel, smell, taste, sound等；
③表示“变得、变成”的连系动词。如become, turn, get, grow, go, fall, come等；
④表示“结果”的连系动词。如turn out, prove等；
⑤表示“仍然”的连系动词。如remain, stand, stay, keep等；
⑥表示“似乎、好像”的连系动词。如seem, appear, look等。
Emergency line operators must always _____ calm and make sure that they get all the information they need to send help.
A. grow B. appear C. become D. stay
【解析】答案为D。become, grow表示状态的变化，stay calm 保持冷静，沉着。
注意：绝大多数连系动词又是实义动词，在解题时要正确区分,否则就会出错。
good, the food has been sold out.
A. Tasted B. Having been Tasted C. Tasting D. To taste
【解析】答案为C。本题考生如果把taste当成实义动词去理解的话，就会误选A或B。其实taste在本句中是连系动词，应该选C才对=Because the food tastes good,…。
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