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作图题：将正三角形ABC绕它的顶点C按顺时针方向旋转90°，作出旋转后的图形。
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反馈参考答案：
举一反三
【单选题】They’re late. The film _____ for 5 minutes.
A.
has begun
B.
has started
C.
has been on
D.
start
【单选题】If we ______ late, they ______ what has happened.
A.
are, will be wondering
B.
were; wondered
C.
will be late; will be wondering
D.
are; are wondering
【多选题】气相色谱分析法在药品质量分析中的应用包括( )
A.
药材、饮片及制剂中部分农药残留量的检测
B.
中药材中二氧化硫含量测定
C.
酊剂（如藿香正气水、十滴水等）中甲醇、乙醇含量测定
D.
药品中有机溶剂残留量检测
【简答题】No one except two students _____ the meeting. [ ] a. has been late for b. have been late for c. was late for d. were later for
相关题目：
【单选题】They’re late. The film _____ for 5 minutes.
A.
has begun
B.
has started
C.
has been on
D.
start
参考解析：
知识点：
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