Question

用空格中的词组填空(注意时态和语态) (1) The discover________ an ancient clock from the tomb． (2) The boy should not ________ in public． (3) The scientist ________his research in the lab all the day． (4) The student ________ reading materials in the reading room this time．

Answer 1

答案：1．dug out;2．be dug at;3．is digging in;4．is digging for;