题目内容
(请给出正确答案)
[单选题]
Which of the following letter parts is optional()?
A.dateline
B.subject line
C.writer' s name
D.salutation
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A.dateline
B.subject line
C.writer' s name
D.salutation
A.Cash
B.Land
C.Accounts receivable
D.Owner's equity
A、of which
B、for which
C、by which
D、to which
A.in which
B.at which
C.on which
D.in that
A.Describing
B.predicting
C.brainstoring
A.by which
B.of which
C.to which
D.for which
We can separate the mixture into the pure chemical compounds______it is composed.
A.in which
B.of that
C.of which
D.from which