A．竞争的B．相干的C．合作的D．不相干的合作学习理论认为，在班级教学中，学生群体的组织形式有三种，即( )。……

多项选择题教学目标包括( )等三个层次。

多项选择题中小学教师职业道德规范的基本内容包括( )。

单项选择题No decision______about any future appointment until all the candidates have been interviewed.

单项选择题Tim is in good shape physically（）he doesn't get much exercise.

A. if
B. even though
C. unless
D. as long as

单项选择题I tried phoning her office, but I couldn't ______.