A、A.if
B、B.unless
C、C.when
D、D.though
答案:B
A、A.if
B、B.unless
C、C.when
D、D.though
答案:B
A. A.commerce
B. B.commercialize
C. C.commercial
D. D.commercially
A. A.Whoever
B. B.Anyone
C. C.Whom
D. D.Who
A. A.will be
B. B.to be
C. C.is
D. D.be