I don't know when my son __________back, but when he __________back ,I'll give you a call

题型：单选题题类：常考题难易度：普通

A、comes, comes B、will come, will come C、comes ,will come D、will come, comes

举一反三

{#blank#}1{#/blank#} he {#blank#}2{#/blank#} his {#blank#}3{#/blank#}, he will fail.

—I don't know if it ____tomorrow. If it ____ , we' ll take the weekend adventure along the "Mountain-Sea-City Connection" hiking trail(路径).

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