问题

In the office an electrical engineer is looking through the instructions to know ________ the heat system works before the repair work

A:whether
B:why
C:how
D:that

正确答案是：

同类题型

I’d rather ride a bike as bike riding has _____ of thetrouble of taking buses.

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Youare_____carefulthanyourbrotherYoutwocan’tdotheworkthatneedscareandskill

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I didn’t see her yesterday. —— Oh, but you ＿＿＿＿＿＿＿＿＿＿＿＿＿＿＿.