1.选C...it在前面做形式主语...
2.选C...首先need to do是固定搭配...第三人称所以加了s...然后因为He needs to know不能构成先行词...所以不能用定语从句...不能用that...
3.选B...impress on sb是固定搭配...make contribution to 固定搭配
1.___ has been announced ,we shall have our final exams next
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