______ you ever have any trouble, let me know.
A．IfB．WheneverC．WhileD．X
C
考查連詞。If 如果； Whenever無(wú)論什么時(shí)候；While  當(dāng)……時(shí)候，強(qiáng)調(diào)主從動(dòng)作的同時(shí)發(fā)生。句意：當(dāng)你有任何麻煩的時(shí)候，讓我知道。從句中已有ever，故不宜再用whenever，故選C。
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