It might have been John _____ bought a present for Mary yesterday.
A．thatB．whenC．whatD．which
A
考查強調(diào)句型，it is that……。本句中引導(dǎo)詞指代前文內(nèi)容，只是其中的動詞be采用了might have been這一復(fù)雜結(jié)構(gòu)。故引導(dǎo)詞用that。選A。
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