12. Our service personnel work for clients on a wide variety of sites, many of _______are tough industrial environments that are unsuitable for laptops or PDAs.A.whom B.them C.which D.that
12. Our service personnel work for clients on a wide variety of sites, many of _______are tough industrial environments that are unsuitable for laptops or PDAs.
A.whom
B.them
C.which
D.that
B.them
C.which
D.that
参考解析
解析：
相关考题：
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