If there were no subjunctive mood, English______much easier to learn.A、could hav

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问题 If there were no subjunctive mood, English______much easier to learn.

选项 A、could have been
B、would be
C、will be
D、would have been

答案 D

解析 must be表示对现在的推测,must have been表示对过去的猜测,句中有明确的过去时间状语,故D为答案。A表示对现在的肯定猜测;B的时态与原句不符;C表达陈述语气,不表猜测。
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