问题

Mary，I don’t know you can come tomorrow morning. —No problem! I’ll be here _I’m free then.

A:if；if
B:if; whether
C:whether；till
D:whether；until;

正确答案是：

同类题型

Li Hua’sshoes are as _______ as Zhang Hui’s.

I need one more stamp before my collection _______.

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he comes, we won’t be able to go.

He insisted everyone here _____ teachers’ instructions. [ ]