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【判断题】
国家标准（GB5768—1999）将交通标志分为主标志和辅助标志两大类。主标志包括：警告标志、禁令标志、指示标志、指路标志、旅游区标志和道路施工安全标志6种。A.
正确
B.
错误
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【简答题】I doubt whether he can _______ his efforts much longer as he looks
very tired.A. hold up B. hold on C. keep on D. keep up
【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
【单选题】I doubt whether he can _______ his efforts much longer as he looks very tired.
A.
hold up
B.
hold on
C.
keep on
D.
keep up
【简答题】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
【单选题】I doubt whether he can ______ his efforts much longer as he looks very tired.
A.
keep out
B.
keep in
C.
keep on
D.
keep at
【单选题】I doubt ______.
A.
whether he can come
B.
if he can come or not
C.
while he will be here
D.
that he will come
【简答题】I doubt whether he can _______ his efforts much longer as he looks
very tired. (4.0分)A. hold up B. hold on C. keep on D. keep up
【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 back
D.
keep from
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