Linda has been drawing ______.
A．since 10 yearsB．for 10 years agoC．since 2002D．in 2002
C
現(xiàn)在完成時的時間狀語經(jīng)常由since或for來引導(dǎo)，since引導(dǎo)點(diǎn)時間，for引導(dǎo)短時間。都表示段時間。
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