Son, you have time to do it, so I suggest you to do it well.
A. plenty of
B. a large scale of
C. a large number of
D. many a
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(答案→)A. plenty of
B. a large scale of
C. a large number of
D. many a
解析：本题考查“许多；大量的”表达方式。句意：儿子，你有足够的时间去做，所以我建议你把它做好。plenty of（足够的）可修饰复数可数名词和不可数名词，但一般不用于否定，疑问句中；a large number of修饰复数可数名词；many a修饰单数可数名词。