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We’ll have a picnic in the park this Sunday _____ it rains or it’s very cold.

A. since      B. if         C. unless       D. until

We’ll have a picnic in the park this Sunday _____ it rains or it’s very cold.

A. since      B. if         C. unless       D. until

We’ll have a picnic in the park this Sunday _________ it rains or it’s very cold.

      A. since            B. if               C. unless          D. until

We'll have a picnic in the park this Sunday ________ it rains or it's very cold.

A．since?? B．if? C．unless?? D．until

We’ll have a picnic in the park this Sunday _____ it rains or it’s very cold.

A. since　 　 B. if　 　　　　 C. unless D. until