问题
选择题
—What ________ to the boy a moment ago? —The knife cut his tiptoe.
A．happen
B．happens
C．will happen
D．happened
答案
D
本题中有个片刻之前的时间短语表示过去，故本题用过去时，happen的过去式是happened，故选D。
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—What ________ to the boy a moment ago? —The knife cut his tiptoe.
A．happen
B．happens
C．will happen
D．happened
D
本题中有个片刻之前的时间短语表示过去，故本题用过去时，happen的过去式是happened，故选D。