单选题 None of these high technology methods are of any value if the sites ______ they are applied have never mineralized, and to maximize the chances of discovery, the explorer therefore pay particular attention to ______ the ground formations most likely to mineralize.
A. that... selecting B. to which... selecting
C. where... select D. which... select

【正确答案】 B

【答案解析】[解析] 本题中第一个空格处为定语从句形式，先行词为“sites”，谓语“apply to”意为“适用于”，因此应采用“介词to+关系代词which”的形式。第二个空格处前面的pay attention to意为“注意”，to为介词，因此后面应用动名词的形式。B项正确。