.I cant find my pen .Who _took__it ( take )
现在找不到钢笔,必然是在此之前有人拿走了.用过去式
I didnt meet him.He_had left____ when I got there.( leave )
当我到那时,他已经离开了.got there 过去时,离开had left是过去的过去,过去完成时
换句话说从句用过去时,主句用过去完成时
.We will go to the cinema if it__is____fine .(be )
主从句时态相一致,现在时和将来时
2.选A.the impression of having written many poems.
give somebody the impression of …… 给某人什么印象（固定短语）
介词of +doing .写了很多诗的印象,当然是现在完成时having written many poems.