问题: 一道英语选择题
--- any trouble with the machine,press this red
button.
A.Would be there B.Should there be
C.If there be D.If there was
解答:
B.Should there be
将来时态的虚拟语气！
原句---If there should be any trouble with the machine,press this red button.
省略if---Should there be any trouble with the machine,press this red button.
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