1.When did you(

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1.When did you(
A.reach B.arrive C.got D.arrive in
这题我选D的,可答案选B,为什么不需要加介词?是我错,
2.Do you have any difficulties ( )out the problem?
A.working B.to work C.works D.work
为什么要选择A
3.Tom has tow sisters ,one is doctor ,( )is cook.
A.anthoer B.others
C.other D.the other
请说明理由

1.B
因为前面用的是When,问“你什么时间到达”,无论题目中还是你将作出的回答中都没有具体地点这一宾语,自然也就不需要介词了~
这样的问题：Which place did you arrive in/at?才是用介词的.
2.
have difficulty(ies) doing 是个固定搭配,只能这么选,仅此而已.
3.D
前面已经说只有两个姐妹,所以one...the other...表示一个和另一个.当涉及的人多于两个时,可以用one...another.或者others

1.When did you finsh_(pack)? 1.--- When did you start colleting stamps? When did you leave? When did you go? when did you ---- here? when did you arrive When did you coneback? -----When did you ___ when did you read English? when did you start to______? When did you go to When did you start skating?