( )2. Mrs. Wang was busy _________ the floor when the telephone rang.
(A) mopping
(B) to mop
(C) mopped
(D) mop
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統計: A(59), B(11), C(3), D(1), E(0) #359929
統計: A(59), B(11), C(3), D(1), E(0) #359929
詳解 (共 1 筆)
#988125
busy後應加V-ing
事實上省略了on,busy (on) V-ing,
介係詞(on)後應加V-ing,所以選mopping
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