-- Do you think Allan came by taxi?-- No. If he had I don't believe he his bike here.A.

问题补充：

-- Do you think Allan came by taxi?

-- No. If he had, I don believe he his bike here.

A. would leave

B. left

C. would have left

D. had left

答案：

A. would leave

B. left

(答案→)C. would have left

D. had left

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