4 ____ a certain doubt among the students as to the necessity of the work.A There has had B They had C There existed D It existed
________scores of times, but Derek still couldn’t understand how to use past participle in a concrete situation.
Thank you for sending us ______ fresh vegetables of many kinds. You have done us _____ great service. A./; a B. the; a C. /;/ D the; /
She’s got the job because she has the advantage _____others of knowing many languages. over B. above C. against D. beyond
—You seem to get lost. Need help? —
red is a symbol of warmth, it can sometimes make people feel uneasy or even frightened.