_________ the President of the UNSC in April 2021, Vietnam ...

★ Gerund & Participle

_________ the President of the UNSC in April 2021, Vietnam is striving to promote ASEAN’s central role.

A. Being

B. Having been

C. To be

D. Is

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_________ their 3-year marriage, the husband regretted _________ his wife well.

A. Looking back on/not to have treated

B. To look back on/ not treating

C. Looking back on/not having treated

D. To look back on/not having treated