John cannot work now because of a health issue, and his wife's job is their ___ source of income.
Askinny
Bprimary正確答案
Ctalkative
Dvarious
答案與詳解
為什麼答案是 B
primary 意為『主要的、首要的』，primary source of income 是固定搭配，表示主要收入來源，完全符合語境。
考點：體型形容詞考點：主要的考點：個性形容詞考點：單複數陷阱
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