急,再两天就考了,求助PREP179

179. In a blow to those who still harbored the illusion that E-mail exchanges are private, a watchdog group recently uncovered a trick for enabling an interloper to rig an E-mail message so that this person will be privy to any comments that a recipient had added as the message is forwarded to others or sent back and forth.

A. who still harbored the illusion that E-mail exchanges are private, a watchdog group recently uncovered a trick for enabling an interloper to rig an E-mail message so that this person will be privy to any comments that a recipient had added

B. who had still been harboring the illusion that E-mail exchanges are private, a watchdog group recently uncovered a trick for enabling an interloper to rig an E-mail message so that this person was privy to any comments that a recipient might have added.

C. who still were harboring the illusion that E-mail exchanges are private, a warchdog group recently uncovered a trick enabling an interloper to rig and E-mail message so that this person is privy to any comments that a recipient would add.

D. still harboring the illusion that E-mail exchange are private , a watchdog group recently uncovered a trick that enables an interloper to rig an E-mail message so that this person will be privy to any comments that a recipient might add

E. still harboring the illusion that E-mail exchanges had been private, a wathchdog group recently uncovered a trick that will enable an interloper to rig and E-mail message so that this person was privy to any comments that a recipient might add.

答案是D,但是those后面不用加who么?

those后面应该可以用ing分词的吧。

去找找看有什么例子