alarm的形容词 alarming 令人担忧的；使人惊恐的； alarmed 惊恐的；受惊的；焦虑的； alarmist 危言耸听的；忧虑的; alarm n. 闹钟；警报，警告器；惊慌； ...
had doing是过去进行时，表示过去某时正在进行的状态或动作。 例句 We were having supper when the phone rang. 我们正在吃晚饭时，电话响了 过去进行时结...
when的用法四种句型be doing sth…when；be about to do sth…when；hardly…when；had just done…when。 1、be doing sth…when… 例He was still smiling when ...
