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In the office an electrical engineer is looking through the instructions to know ________ the heat system works before the repair work.
A.whetherB.why
C.howD.that
C
C 考察宾语从句。句意:办公室里的一名电气工程师在浏览说明书为了弄明白供热系统是如何工作的。本句是一个宾语从句,表示方式。根据句意可知C正确。
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