--what can I do for you?-- if you__see Mr Black,give him regards.A should B would C shall D will为什么选A?

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--what can I do for you?-- if you__see Mr Black,give him regards.
A should
B would
C shall
D will
为什么选A?

if you should see Mr Black 在这里是 如果你要是有机会看到布莱克先生的话 的意思.而would应该就是指如果你将能看到布莱克先生的话 意思有差啦!