56.Weverymuchregretthatwecannotacceptyourclaimonthecoffeesetsfromthebatch____youcomplain.
A. which
B. ofwhich
C. aboutwhich
D. onwhich
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57.Weregretthedelayeddeliveryandtheinconvenience____itiscausingyou.
A. /
B. since
C. which
D. what
58.OurproductsaredisplayedinStandB22,____youwillfindmeduringofficehours.
A. when
B. which
C. that
D. where
59.Thediscountof5%agreedonwasgrantedonly____nobalancewasoutstandingfrompreviousaccounts.
A. oncondition
B. onconditionthat
C. onthat
D. dependson
60.____ourcustomersarenowurgentlyneedingthegoods,wemustaskyoutomaketheearliestpossibledelivery.
As
Becauseof
C. That
D. Whether