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16._______ adequate preparation,you don’t have much chance o

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16._______ adequate preparation,you don’t have much chance of success.
A.After B.Without C.With D.Before
17.Read the book carefully ____ you’ll find lots of information related to our research.
A.if B.of C.for D.while
18.I like climbing mountains _____ my wife prefers water sports.
A.as B.when C.for D.while
19.Why not _____ to Professor Smith for advice?He is an expert in this field.
A.go B.your going C.to go D.you go
20.The kids lay face down on the beach,their backs ____ to the sun.
A.exposing B.exposed C.having exposed D.were exposing
16 B
17 C C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
18 D
19 A
20 B