only in this way _____ cross the river at that time.a.will he b.he can c.could he d.he could 为什么

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only in this way _____ cross the river at that time.
a.will he b.he can c.could he d.he could 为什么

C.这里是only的倒装句..only要提至句首+助动词+主语+谓语..后面的时间状语是at that time 表示过去的时间所以用过去式