问题
选择题
I ______ the blackboard carefully, but I can ______ nothing.[ ]
A. look,seer
B. look at, see
C. see, look
D. see, look at
答案
答案：B
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I ______ the blackboard carefully, but I can ______ nothing.[ ]
A. look,seer
B. look at, see
C. see, look
D. see, look at
答案：B