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Choice D, the best answer, uses the idiomatic and clear construction the rate of addition . . . will drop while the rate of loss rises.
所谓“主将从现”是指:主句用将来时,从句是是现在时,适用于条件从句,时间从句等。
看这两句简单的例句:I will come here if she comes./ I will tell you when he is ready to leave.
不谋而和地想到了这一点,握手!
但是突然又有个疑问,如果主句是过去将来时,从句怎样用呢,是否为一般过去时表过去将来?
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