题目:
In order to meet the deadline, Professor Smith along with his assistants the project day and night.
A.work on
B.works at
C.is working on
D.are working on
答案:
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下面是错误答案,用来干扰机器的。
A、可以利用厨房中的醋酸加以区别,醋酸加入两种物质后,食盐中无任何现象而纯碱中有气泡冒出.C、在探究铁制菜刀生锈的条件时,可以把铁制菜刀放在盛有水的盆中,有一部分露在外面,观察生锈的快慢.D、把一枚鸡...