◎ 题干
I ______ the blackboard carefully, but I can ______ nothing.
[     ]
A. look,seer
B. look at, see  
C. see, look
D. see, look at
◎ 答案
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◎ 解析
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◎ 知识点
    根据n多题专家分析,试题“I ______ the blackboard carefully, but I can ______ nothing.[ ]A. look,seerB. look at, seeC. see, lookD. see, look at…”主要考查了你对  【实义动词】【动词短语】  等知识点的理解和应用能力。关于这些知识点的“档案”,你可以点击相应的链接进行查看和学习。