18.It was 5o'clock ______ the front doorbell opened..( )
A. | that | B. | when | C. | what | D. | in which |
17._________ in the agreement that you should not rent the house ______ others.( )
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A. | What is required; to | B. | What requires; for | ||
C. | It is required; to | D. | It requires; for |