问题补充：
There a ruler and two pens on the desk/
A. are
B. is
C. be
D. am
答案：
A. are
(答案→)B. is
C. be
D. am
解析：B 考查there be的用法。there be遵循就近原则，离最近的是“a ruler”，是单数，故用is。
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