李世民是个好皇帝吗:optional subject

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He asked me to lend him some money, which I agreed to do, ________ that he paid me back the following week.

A. on occasion B. on purpose C. on condition D. only if

C
on condition that
adv.
如果

选C
on condition that 表示 只要,如果

C

选C绝对没有错 表示只要,如果

c
他问我借钱.我同意了,但前提是他必须在下个星期还我钱.

He asked me to lend him some money, which I agreed to do, ________ that he paid me back the following week.

A. on occasion B. on purpose C. on condition D. only if

我觉得是D
C和D都有‘只要’的意思
但是 后面跟的 是paid 过去式 虚拟语气
所以是only if