His pet dog _______just 100 grams at birth last month.

A. weighs B. weighed C. weigh D. weight

B 【解析】句意：他的寵物狗上個月出生時體重只有100克。A. weighs動詞三單，稱重；B. weighed 動詞過去式；C. weigh動詞，重；D. weight名詞，重量。本句是一般過去時態(tài)，謂語動詞使用過去式。故選：B。
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