(单选题)
Because clouds, smoke and so on will absorb laser beam, a pipe would be used ______ the laser beam would be sent.
A.which
B.through which
C.of which
D.that
参考答案：B
参考解析：
考查介词+关系代词的用法。句意：因为云、烟等会吸收激光束，所以会用一根管子将激光束发送出去。根据句意可知，此处______ the laser beam would be sent充当先行词a pipe的后置定语从句，且先行词和关系词之间需要使用介词through，表示“通过管道将激光束发送出去”。故选B。
知识点：
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