The visiting diplomat spoke only ( ) at the international conference before returning to Johannesburg.
A.frequently
B.constantly
C.usually
D.briefly
【答案】D。“在国际会议上仅…的讲话”。选项A：经常地、常常地;选项B：不断地;选项C：通常;选项D：简明扼要地。根据句意可知补充“简明扼要的讲”更合适，只有D项修饰spoke更合适。故本题正确答案选D。
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