a number of tourists__yangzhou many times because it is beautifula have been to.Bwent to.Cwill go t.Dhave gone toji讲清楚原因

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a number of tourists__yangzhou many times because it is beautifula have been to.Bwent to.Cwill go t.Dhave gone toji讲清楚原因
a number of tourists__yangzhou many times because it is beautiful
a have been to.Bwent to.Cwill go t.Dhave gone to
ji讲清楚原因

a number of tourists__yangzhou many times because it is beautifula have been to.Bwent to.Cwill go t.Dhave gone toji讲清楚原因
A因为前面是名词复数所以谓语必须相应用复数.至于要用have been to是因为后面出现了many times.所以现在完成时表示一种经历.

选a have been to. 已经去过(经历过) have gone to 去了(不在此地了)

答案a
a number of谓语动词用复数,而the number of谓语动词才用单数。去过很多次have been 表示状态,一直进行的状态。have gong to只能表示去过。
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