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1.What do you think _____an apple ______to the ground?

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1.What do you think _____an apple ______to the ground?
A.cause;to fall B.to cause;falling C.causing;falling D.causes;to fal
2.He looks very young.He ____be over 30
A.can't B.may not
3.With so much work _____my mind,I almost break down
A.filled B.filling C.being filled
4.He wrote a letter to me ____that his trip had been put off
A.informing B.informed Cinform
1.D(这题有点不确定,就不做具体解释了)
2.A(根据语境,前面有一句he looks very young.所以应该用比较肯定的语气)
3.B(这题考查with的复合结构,主要靠with后跟的主语跟动作是主动关系还是被动关系,主动用ing,被动用ed
4.A(根据主句只能有一个动词可直接排出C,这里是用ing 表示伴随状态,即这个letter意在通知……,当然也可根据自己的理解对ing做自己的理解)