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 考察賓語(yǔ)從句。句意：辦公室里的一名電氣工程師在瀏覽說(shuō)明書(shū)為了弄明白供熱系統(tǒng)是如何工作的。本句是一個(gè)賓語(yǔ)從句，表示方式。根據(jù)句意可知C正確。
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