题目内容
茶壶内壁覆盖有 CaCO3水垢，若要洗净水垢，最好的方法是（ ）
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Choose the correct word tor each of the following sentences.Either of the tools (are, is) used to repair this machine.
Not only the workers but also the manager (is, are) against the decision.
These pairs of shoes (is, are) not of the same color.
It seems to me that neither of the business partners (is, are) entirely right on any issue.
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