题干
It____ Tom that parked the car here, as he is the only one with a car.
A：may be
B：can be
C：must have bee
D：should have bee
答案(点此获取答案解析）
C
3Z(g) △H<0，反应过程持续升高温度，测得混合体系中X的体积分数与温度的关系如图所示。下列推断正确的是（ ）