初中英语常用介词的辨析单选题

The train ______ Beijing is going to set off.

A．of

B．to

C．in

D．on

She is very tired. She is standing ___________ the door.

A．to

B．against

C．in

D．from

It’s hot ____________summer in Beijing.

A．by

B．on

C．at

D．in