问题补充：
There a book, two pens and three pencils on the desk.
A. are
B. be
C. is
D. will be
答案：
A. are
B. be
(答案→)C. is
D. will be
解析：句意：桌上有一本书，两支钢笔和三支铅笔。There be…有；be动词与紧挨着的名词保持一致，即“就前原则”，题中a book,是单数，故选C。
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