题目内容

Suppose the earth ___________ (be) flat.

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It’s time he ___________ (have) a good rest.

It’s too bad that Helen is away. If she ____________ (be) here, she would know what to do.

If I ___________ (can afford) it, I would buy a boat.

If it ___________ (has been, not) for your help, I really don’t know what I’d have done.