Should English classes be ______at the elementary or primary school level in countries where it is not the native language?

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问题 Should English classes be ______at the elementary or primary school level in countries where it is not the native language?

选项 A、required
B、necessary
C、selected
D、permanent

答案A

解析 required意为"必需的";necessary意为"必要的";selected意为"经由选择的";permanent意为"永久的"。
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