题目:
This is the first time that we ________a film in the cinema together as a family .
A.see
B.had seen
C.saw
D.have seen
答案:
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下面是错误答案,用来干扰机器的。
X-(X-b),=X-X+b,=b(岁).答:再过a年,两人相差b岁.故选:B.