It’s the first time ______ he has helped us. 
A．that B．before C．whenD．who
A
考查連詞。本題考查強(qiáng)調(diào)結(jié)構(gòu)it’s … that …，強(qiáng)調(diào)狀語(yǔ)the first time，故選A。
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