78. --- You repay this debt this week according to the agreement. --- Don’t worry. I pay

问题补充：

78. --- You repay this debt this week according to the agreement.

--- Don’t worry. I pay it off before the deadline.

A. must; will

B. shall; must

C. should; am due to

D. shall; am bound to

答案：

A. must; will

B. shall; must

C. should; am due to

D. shall; am bound to

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