The missing boys were last seen ________ near the river.
A
所填的词为主语补足语，因其后有明确的地点，补足语表示动作当时正在进行中，所以只能使用playing。
A well-known example of the large scale destruction of an ecosystem through vegetation removal to accommodate tourist facilities is the case of the _______.
The visiting minister expressed his satisfaction with the talks, ________ that he had enjoyed his stay here.
WhichofthefolloingisNOTincludedinthefabledFiveMountainsinChina?
He shook hands with the visitors ________ as to convey his apology.