This article deals with the natural phenomenon which _______ most interesting to everyone. 单选题 (10 分) 10分 A. are B. is C. they are

This article deals with the natural phenomenon which _______ most interesting to everyone.
单选题 (10 分) 10分
A.
are

B.
is

C.
they are

出自：国家开放大学理工英语

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