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1.There are five pairs____,but I'm at loss which to choose.

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1.There are five pairs____,but I'm at loss which to choose.
A to be chosen
B to choose from
C to choose
D for choosing
2.After she considered the problem,she got a tall box to stand_____.
A by
B on
C up
D with
3.Charles Babbage is generally considered______the first computer.
A to invent
B inventing
C to have invented
D having invented
4.'Where is Davied?""He is upstairs____ready to go out."
A to get
B getting
C to be getting
D having got
5.With a lot of difficult problems_____,the newly-elected president is having a hard time.
A settled
B setting
C to be settled
D being settled
6.If the car won't start,____it.
A try push
B try pushing
C try to push
D to try pushing
1 B to choose (one)from the five pairs 中的from 是指从中选
2 B 句意是站在盒子上,故用stand on
3 C to have invented 是不定式的完成式,表明动作发生在谓语动词动作is considered 之前.
4 B 现在分词作伴随状语.
5 答案应为to settle,with复合结构中用不定式表示将来的动作.
6 B try doing 试着去做,即试着用另一种方式;try to do 尽力、努力做某事
补充:建议二楼查一下语法书,不要误导楼主.
1 难道说这五双都要选择吗?只是从中选择一双而已.而且,在there be 结构中,主语后常用不定式的主动表被动.
5 with sth to do 复合结构作状语时,当句子的主语与不定式有逻辑上的主谓关系时,不定式用主动表被动.所以楼主给的第5题最好用to settle,而不是to be settled.