绘制生物图像的细微结构时,勾画的图像轮廓经修改后,使用铅笔[ ]
A.将图像轮廓要描清
B.线条要均匀,粗细要一致
C.线条相接处不要出现分叉
D.以上都对
答案:D
Had it been possible I would have gone to the movies but I________ busy. [ ]
A. had been
B. am
C. was
D. would be
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