问题
选择题
We have worked for three hours. Now let's stop ______a rest. [ ]
A. had
B. have
C. to have
D. having
答案
答案：C
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We have worked for three hours. Now let's stop ______a rest. [ ]
A. had
B. have
C. to have
D. having
答案：C
，应采取的正确措施是（）
长轴使颈部向后倾斜
排列，使颊尖连成的曲线突度更明显