【GMAT考满分语法SC题库】A team of British researchers, having spent _真题_答案

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A team of British researchers, having spent three seasons investigating and mapping a region in West Antarctica, has discovered a massive ancient subglacial trough deeper than the Grand Canyon.

A
A team of British researchers, having spent three seasons investigating and mapping a region in West Antarctica, has
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B
A team of British researchers have investigated and mapped a region in West Antarctica over three seasons, and have
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C
A team of British researchers spending three seasons investigating and mapping a region in West Antarctica have
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D
A team of British researchers has spent three seasons investigating and mapping a region in West Antarctica,
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E
A team of British researchers has spent three seasons in a region in West Antarctica, and when investigating and mapping,
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正确答案: A

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