She pretended _______ me when I passed by.
A:not to see
B:not seeing
C:to not see
D:having not seen
—Yes. But they would taste _______ with butter!
学校作息时间表在不同季节往往会根据当地白昼时间的长短作相应调整。下列节日中启东市白昼时间最短的是( )
植物可以进行无土栽培的原因是( )