In metalwork, one advantage of adhesive-bonding over spot-welding is that the contact, and hence the bonding, is effected continuously over a broad surface instead of a series of regularly spaced points with no bonding in between.

B. as opposed to
C. in contrast with
D. rather than at
E. as against being a

[spoiler]OA: D[/spoiler] Really, really confuse with those prepositions. Some one helps explain them clearly pls. Thanks.