问题描述：
1)Either you or I _____going to the supermaket tomorrow.
A:are B:am C:were D:finished
2)Upon_____his homework,he started playing games with his friends
A:finishing B:finished C:finishes D:finished
3)It,s necessary _____us to go over what we have learned
A:to B:with C:of D:for
（请解释选择的原因,
A:are B:am C:were D:finished
2)Upon_____his homework,he started playing games with his friends
A:finishing B:finished C:finishes D:finished
3)It,s necessary _____us to go over what we have learned
A:to B:with C:of D:for
（请解释选择的原因,
问题解答：
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