Deposits of gravel are formed______the weathering of rocks and the erosive and concentrating action of rivers and waves.

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问题 Deposits of gravel are formed______the weathering of rocks and the erosive and concentrating action of rivers and waves.

选项 A、whenever
B、as a result of
C、are due to
D、because

答案B

解析 句意:砂砾的沉积是由于岩石的风化以及河流波浪的腐蚀和聚集作用造成的。because,due以及as a result of可以表原因,但是because后面只能跟句子,故排除。同时题干是完整句子,因此空格处应当填入分词或介词短语,因此只有B项符合要求。
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