词汇网络: ongoing

过去进行时：中断的动作 (was/were -ing + when)

verbs_tenses

A2

现在完成时：For 与 Since (持续性动作)

verbs_tenses

B1

现在完成进行时：正在进行的旅程 (have been -ing)

verbs_tenses

B1

谈论正在进行的动作 (现在完成进行时)

verbs_tenses

B1

过去进行时：构成 (was/were + ing)

verbs_tenses

A2

关于……存在持续的争论

Argumentation and critical discussion expression

C2

感谢您的持续光顾

Formal business communication expression

B2

一次又一次

Repeatedly and persistently.

学术论述揭示了

Academic essay writing expression

C1

冒风险

Take a chance

B2

employ staff

Hire workers

B1