四六级考试

解析：I doubt whether he can _______ his

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【单选题】I doubt whether he can _______ his efforts much longer as he looks very tired.


A．keep up
B．keep on
C．keep in
D．keep at


网考网参考答案：A
网考网解析：
keep up“坚持，维持”；keep on“继续”；keep in“抑制”；keep at“坚持”。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>

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