问题
单项选择题
Several shoals（）reported to exist in the area south-west of the Brothers.
A.have
B.have been
C.has
D.has been
答案
参考答案：B
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Several shoals（）reported to exist in the area south-west of the Brothers.
A.have
B.have been
C.has
D.has been
参考答案：B
