You have my personal assurance ______ be cancelled, you will receive an immediate and full refund. A. when this cruise should B. that should this cruise C. since this cruise should D. while this cruise shou...

14 Jun 2017

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Question about English (US)
You have my personal assurance ______ be cancelled, you will receive an immediate and full refund.

A. when this cruise should
B. that should this cruise
C. since this cruise should
D. while this cruise should

The answer is B, I chose A, though.
I don't understand why the answer is B.

Please explain in a way that easy to understand.

Native language
English (US)
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