In the office an electrical engineer is looking through the instructions to kno

题干

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

上一题下一题 0.64难度单项选择更新时间:2014-04-19 10:35:42

小学学科试题库

初中学科试题库

高中学科试题库