there ----------------- an eraser on the desk.

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there ----------------- an eraser on the desk.

there ----------------- an eraser on the desk.
there ----------------- an eraser on the desk.

there ----------------- an eraser on the desk.
is
后面是单数,一块橡皮.所以要用is
翻译:桌上有一块橡皮.

is

is,there be 句型中的谓语根据后面的名词定,an eraser是单数所以用is。