Please let us________ if you have good suggestions, however, we ________ the difficulty working out the subject early.
A.know; recognized
B.recognize; know
C.recognize; recognized
D.know; recognize
对258人提供帮助
考查两个动词know和recognize的用法.从整个句子来理解,第一空Please let us know意思是请告诉我们,从而可排除B和C两项,再从时态来分析,应选A.