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1.___hard he studies,he can't catch up with his friend in En

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1.___hard he studies,he can't catch up with his friend in English.
a.however b.whatever c.no matter d.though
2.if we want to call him ,we have to ___up the number in the telephone book.
a.look b.search c.find d.see
3.It was yesterday ___the accident took place.
a.when b.that c.where d.which
1.选b,whatever等价于no matter what,意思是无论如何
2.选a,look up固定搭配查找的意思
3.选a,when与时间连用,前面是yesterday为时间