the student saw something strange ______when they were walking near the rivera happen b happens c happened d to happen

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the student saw something strange ______when they were walking near the rivera happen b happens c happened d to happen

the student saw something strange ______when they were walking near the rivera happen b happens c happened d to happen
the student saw something strange ______when they were walking near the river
a happen b happens c happened d to happen

the student saw something strange ______when they were walking near the rivera happen b happens c happened d to happen
A
see sb do sth
happen 是不带to 的不定式做宾补

d

C

A