Another thing that he ___very difficult was English grammar.
A．findB．foundC．findingD．to find
B

試題分析：句意：他發(fā)現(xiàn)的非常難的另一件事情是英語語法。由主句內(nèi)容的過去時態(tài)，可知定語從句描述的是過去已發(fā)生的動作，故選B。
點評：定語從句的時態(tài)取決于從句描述內(nèi)容的發(fā)生時間，與主句沒有必然的關(guān)系，需要根據(jù)具體情況具體分析。
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