英语语法训练19条件句

c. if you had discovered what he had known.

8. We'll have to walk if we

a. run out of gas.

b. are going to run out of gas.

c. ran out of gas.

9. If someone offered to buy you one,

a. which one do you choose?

b. which one would you choose?

c. which one had you chosen?

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