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题型：单选题题类：常考题难易度：普通

过去将来时——含时间状语从句或条件状语从句的主句

I knew he me if he was free the next day.

A、helped B、would help C、help s D、will help

举一反三

You'd better look up the new word in a dictionary _____ you don't know it .

More historical buildings in the old town will fall down ________we try our best to protect them.

A tourist will easily lose his way in shanghai ________ he has a map or a guide.

—Shall we go for a hiking this weekend?

—All right, it rains.

如果你不努力工作，你就不会成功。

You won't {#blank#}1{#/blank#} {#blank#}2{#/blank#} {#blank#}3{#/blank#} {#blank#}4{#/blank#} work hard.

I ________ her the answer if she ________ me.

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