问题
选择题
It might have been John _____ bought a present for Mary yesterday.
A．that
B．when
C．what
D．which
答案
答案：A
考查强调句型，it is that……。本句中引导词指代前文内容，只是其中的动词be采用了might have been这一复杂结构。故引导词用that。选A。
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