分詞

6) __________ to steel, chromium(鉻) increases the metal's hardness.

[A] Added

[B] In addition

[C] Adding

[D] Adds

解析：A為正確答案。(同上)

7) __________ enough food and water, they could have beaten the enemy.

[A] Being given

[B] Given

[C] Give

[D] To give

解析：B為正確答案。(同上)

3. 表示原因

8) Encouraged by his mother, ________________________.

[A] art was studied in Florence by John Singer Sargent

[B] Florence was where John Singer Sargent studied art

[C] the study of art in Florence by John Singer Sargent

[D] John Singer Sargent studied art in Florence.

解析：D為正確答案。四個(gè)選項(xiàng)中，只有D的主語(yǔ)為“John Singer Sargent”(人名) ，而只有人才能被“encouraged”(鼓舞)，也就是說(shuō)，只有D中的主語(yǔ)能充當(dāng)空白前-ED分詞短語(yǔ)的邏輯主語(yǔ)。