问题标题：
【16._______adequatepreparation,youdon’thavemuchchanceofsuccess.A.AfterB.WithoutC.WithD.Before17.Readthebookcarefully____you’llfindlotsofinformationrelatedtoourresearch.A.ifB.ofC.forD.while18.Ilikeclimbingmountains___】
问题描述：
16._______adequatepreparation,youdon’thavemuchchanceofsuccess.
A.AfterB.WithoutC.WithD.Before
17.Readthebookcarefully____you’llfindlotsofinformationrelatedtoourresearch.
A.ifB.ofC.forD.while
18.Ilikeclimbingmountains_____mywifepreferswatersports.
A.asB.whenC.forD.while
19.Whynot_____toProfessorSmithforadvice?Heisanexpertinthisfield.
A.goB.yourgoingC.togoD.yougo
20.Thekidslayfacedownonthebeach,theirbacks____tothesun.
A.exposingB.exposedC.havingexposedD.wereexposing
李云艳回答：
16B
17CC是对的,但不标准,认真读书,是【为了】找【头绪/资料】
顶x_tasy,and就最好了
18D
19A
20B
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