21. Covering the metal with paint have been the most widely used method for preventing rusting.
(A)with
(B)have been
(C)widely
(D)rusting

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統計： A(12), B(166), C(22), D(36), E(0) #1619300

詳解 (共 2 筆)

#2694803
在金屬上塗料是防止生鏽最普遍的方法。ha...
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#2541520

Covering the metal with paint have been the most widely used method for preventing rusting.

用油漆覆蓋金屬是防止生鏽最常用的方法。


我個人理解應將"have been"改成"has been"。剛看下面才知原來這題是挑錯，那麼我的理解是對的。

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