Question

【题目】There were ______ people at the concert. It's crowded.
A.thousands
B.thousand
C.many thousands
D.thousands of

Answer 1

【答案】D
【解析】基数词hundred，thousand, million前面有数词时为实数意义，词尾不能加s；前面无数词时，词尾可以加s，与of构成短语，表示虚数意义，意为“数以……计的”。