题目内容

一Let’s start to make dinner!
一Mom , it’s best to read the instructions         using the new microwave oven.
A．beforeB．butC．andD．or
A

试题分析：句意：让我们开始做晚餐吧!妈妈,在用新微波炉之前最好先看看说明. A．before在……以前；       B．but但是；C．and 和；D．or否则。结合句意，故选A
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