there's only one problem（） they propose A about which B of which C on which D that

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there's only one problem（） they propose A about which B of which C on which D that
there's only one problem（） they propose A about which B of which C on which D that

there's only one problem（） they propose A about which B of which C on which D that
D定语从句的先行词有only修饰的时候,只能用that作引导词

B of which

there's only one problem（ ） they propose A about which B of which C on which D that

there's only one problem（） they propose A about which B of which C on which D that