By the end of last week, we __________ a satisfactory solution to the problem.
A．have foundB．will be findingC．had foundD．found
C
考查時態(tài)。By到….為止，與完成時連用；句中the end of last week又是指過去的時間，所以使用過去完成時。句意：到上個星期結(jié)束的時候，我們已經(jīng)找到了這個問題的令人滿意的解決方法。
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