He made _____ experiments to prove his theory, and the number _____ added up to 600A.a large number of ;haveB.a great deal of; hasC.a great many; hasD.plenty of; have
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C解析试题分析：考查词组辨析和主谓一致：第一空experiments为可数名词，用a large number of（许多的，大量的）的修饰；第二空the number 为……的数目，做主语时是单数形式，因而用has。选C。考点：考查词组辨析和主谓一致
点评：同样是大量的： a large number of修饰可数名词复数， a great deal of修饰不可数名词，a great many修饰可数名词，plenty of修饰可数或不可数名词。