问题
选择题
Our teacher looked here and there on our playground _____ looking for something.[ ]
A. even though
B. even if
C. as if
D. only if
答案
答案：C
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Our teacher looked here and there on our playground _____ looking for something.[ ]
A. even though
B. even if
C. as if
D. only if
答案：C
支托凹制备时，其宽度应为前磨牙