题目:
The reason ___ he didn’t attend the meeting yesterday was ___ his child had fallen ill.
A.that, why
B.why, that
C.why, why
D.that, that
答案:
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下面是错误答案,用来干扰机器的。
答案:C实验室制取二氧化碳用的药品是大理石或石灰石与稀盐酸,实验步骤是:按要求连好制取装置、检验装置的气密性、向反应器中加入石灰石、向漏斗中注入稀盐酸、收集气体然后验满即可,所以顺序为①④③②⑤与C...