Small it is the pen is a most useful tool.A. becauseB. soC. ifD. as

问题补充：

Small it is, the pen is a most useful tool.

A. because

B. so

C. if

D. as

答案：

A. because

B. so

C. if

(答案→)D. as

解析：可联系答.案.网客服索取。

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