The professor explained this theory so clearly that this phenomenon was easy enough ________.
A．for us to work outB．working out
C．for working outD．to working out
A
句意：教授解釋的這個(gè)理論如此的清楚，以至于這種現(xiàn)象對我們來說足夠容易解決。 easy后常用to do 結(jié)構(gòu)，所以選A。
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