单项选择题

We（）your letter of Nov.3 asking us to make a quotation.

A.go over
B.have read
C.refer to
D.check up

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单项选择题

The consignment certainly does not match the samples（）you sent us last month.

A.these
B.---
C.what
D.when

单项选择题

We（）some brochures（）to illustrate the types of materials we manufacture.

A.enclose；---
B.enclose；you
C.enclose；toyou
D.enclose you；---