Which of the following is an adverb of frequency?
A. slowly
B. there
C. usually
D. really
查看答案
Which of the following options uses the present simple question form?
Are you going on holiday this year?
B. Do you go on holiday every year?
C. Have you ever been on holiday?
Did you go on holiday last year?
Which of the following options is NOT a typical usage of the present perfect tense?
A. Completed actions at an indefinite time/general experience
B. Actions completed in the past at a definite time
C. Something which began in the past and continues at the time of speaking
D. Past actions with present results
Which of the following options is NOT a typical usage of the present simple?
A. Habits
B. Routines
C. Facts
D. Actions in progress at the time of speaking
提高混凝土拌合物的流动性，可采取的措施是( )。
A.增加单位用水量
B.提高砂率
C.增大水胶比
D.在保持水胶比一定的条件下，同时增加水泥用量和用水量
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